Popping and stalling after warm startup - Mustang Evolution

Go Back   Mustang Evolution > 1979-2015 Mustang GT || Tech and Talk > 1996-2004 Mustang GT



Reply
 
Thread Tools Search this Thread
Please support our sponsors and let them know you heard about them here!
Old 03-08-2015, 08:05 PM   #1
Registered Member
Regular
 
GHO5T5NIPER's Avatar
 
Join Date: Sep 2012
Region: Kansas
Posts: 476
Popping and stalling after warm startup

Hey guys I just got finished with a 500 round trip to Kansas City and after stopping at a quick shop and turning the car back on the exhaust crackled a bit and popped on crank and then turned off. When I turn the key it immediately starts up without any problems. Only happened a couple times. Most of the time it's normal. Never had it on a cold start yet. What could this be? Have a Bama tuner, I know your guys opinions on them but any ideas?


Sent from my iPhone using Mustang Evolution
GHO5T5NIPER is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 03-08-2015, 09:17 PM   #2
Registered Member
Regular
 
Join Date: Mar 2013
Location: Salinas
Region: California
Posts: 7,416
Scan for trouble codes.
straybullitt is offline   Reply With Quote
Old 03-08-2015, 09:18 PM   #3
Registered Member
Regular
 
GHO5T5NIPER's Avatar
 
Join Date: Sep 2012
Region: Kansas
Posts: 476
Quote:
Originally Posted by straybullitt View Post
Scan for trouble codes.

Already did. No codes


Sent from my iPhone using Mustang Evolution
GHO5T5NIPER is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 03-08-2015, 09:22 PM   #4
Registered Member
Regular
 
Join Date: Mar 2013
Location: Salinas
Region: California
Posts: 7,416
Hmmm.
I think that I would load the stock tune for a while and see if the problem goes away.
straybullitt is offline   Reply With Quote
Old 03-08-2015, 09:35 PM   #5
Registered Member
Regular
 
GHO5T5NIPER's Avatar
 
Join Date: Sep 2012
Region: Kansas
Posts: 476
Well I have had this same tune on for over a year now without any problems


Sent from my iPhone using Mustang Evolution
GHO5T5NIPER is offline   Reply With Quote
Old 03-08-2015, 10:53 PM   #6
Registered Member
Regular
 
Panther140's Avatar
 
Join Date: Sep 2014
Location: xxx
Region: Other
Posts: 1,473
Check your fuel pressure next time that happens. It could be shutting the fuel pump off for no apparent reason. Computers are weird..


Get out of ur car and check it at the Schrader valve right after it dies. It should have over 35 PSI or around that
Panther140 is offline   Reply With Quote
Old 03-09-2015, 08:42 AM   #7
Site Sponsor
 
Join Date: May 2014
Location: Malvern, PA
Region: Pennsylvania
Posts: 2,510
Quote:
Originally Posted by GHO5T5NIPER View Post
Hey guys I just got finished with a 500 round trip to Kansas City and after stopping at a quick shop and turning the car back on the exhaust crackled a bit and popped on crank and then turned off. When I turn the key it immediately starts up without any problems. Only happened a couple times. Most of the time it's normal. Never had it on a cold start yet. What could this be? Have a Bama tuner, I know your guys opinions on them but any ideas?
Quote:
Originally Posted by GHO5T5NIPER View Post
Well I have had this same tune on for over a year now without any problems

Hey GHO5T5NIPER - Sorry to hear about the trouble you're having with your car. This is definitely on the odd side and It's even more strange that you're not throwing any codes as well! When was the last time you did some routine maintenance? Simple stuff like plugs, filters? etc. If you had been running the same tune all this time without anything popping up I'm confident that there's very likely a mechanical issue going on here. Let me know if you have any questions and I'm here to help!

Alex
__________________
Alex Lazarus | AmericanMuscle.com
Toll Free: 1-866-363-4591
Bama Hotline: 888.226.9764 | M-F 9AM-5:30PM EST
WIN A SUPERCHARGED MUSTANG & 2017 RAPTOR!
Free Same-Day Shipping!
AMAlexLazarus is offline   Reply With Quote
Old 03-09-2015, 08:59 AM   #8
Registered Member
Regular
 
GHO5T5NIPER's Avatar
 
Join Date: Sep 2012
Region: Kansas
Posts: 476
Quote:
Originally Posted by AMAlexLazarus View Post
Hey GHO5T5NIPER - Sorry to hear about the trouble you're having with your car. This is definitely on the odd side and It's even more strange that you're not throwing any codes as well! When was the last time you did some routine maintenance? Simple stuff like plugs, filters? etc. If you had been running the same tune all this time without anything popping up I'm confident that there's very likely a mechanical issue going on here. Let me know if you have any questions and I'm here to help!

Alex

Everything is brand new. New oil 500 miles ago, use premium 91 octane gas, brand new fuel filter 1k miles ago, new motorcraft plugs. Like I said it runs perfectly fine otherwise and it really only happens 10% of the startups


Sent from my iPhone using Mustang Evolution

---------- Post added at 07:59 AM ---------- Previous post was at 07:58 AM ----------

Quote:
Originally Posted by Panther140 View Post
Check your fuel pressure next time that happens. It could be shutting the fuel pump off for no apparent reason. Computers are weird..


Get out of ur car and check it at the Schrader valve right after it dies. It should have over 35 PSI or around that

Ok where exactly is this valve and how do I test it?


Sent from my iPhone using Mustang Evolution
GHO5T5NIPER is offline   Reply With Quote
Old 03-09-2015, 09:55 AM   #9
Registered Member
Regular
 
fenixignition's Avatar
 
Join Date: Nov 2014
Location: Clearwater, fl
Region: Florida
Posts: 1,050
Quote:
Originally Posted by GHO5T5NIPER View Post
Everything is brand new. New oil 500 miles ago, use premium 91 octane gas, brand new fuel filter 1k miles ago, new motorcraft plugs. Like I said it runs perfectly fine otherwise and it really only happens 10% of the startups


Sent from my iPhone using Mustang Evolution

---------- Post added at 07:59 AM ---------- Previous post was at 07:58 AM ----------




Ok where exactly is this valve and how do I test it?


Sent from my iPhone using Mustang Evolution
while facing the front of the car, look at your passenger side fuel rail, right above the front passenger side coil. theres a little black (usually) cap that you can unscrew. it has a shrader valve, much like a tire valve. its pressurized (supposed to be anyway) and will spray gasoline if you poke the needle in it.

as far as testing it, you need to buy or borrow a fuel pressure tester. which just plugs into that valve, and gives you a reading on the current pressure in the fuel line.
__________________
2002 GT 5sp. 16x,xxx miles
Steeda Exhaust, C&L plenum, BBK Throttle Body, Steeda Underdrive, Steeda short throw, unknown stage clutch. Rear main leak. Compressor seal leak. Steeda lower control arms. good tires.
fenixignition is offline   Reply With Quote
Old 03-09-2015, 10:04 AM   #10
Registered Member
Regular
 
GHO5T5NIPER's Avatar
 
Join Date: Sep 2012
Region: Kansas
Posts: 476
Quote:
Originally Posted by fenixignition View Post
while facing the front of the car, look at your passenger side fuel rail, right above the front passenger side coil. theres a little black (usually) cap that you can unscrew. it has a shrader valve, much like a tire valve. its pressurized (supposed to be anyway) and will spray gasoline if you poke the needle in it.

as far as testing it, you need to buy or borrow a fuel pressure tester. which just plugs into that valve, and gives you a reading on the current pressure in the fuel line.

Alright I'll throw a pressure tester in the trunk for when it happens next. Thanks!


Sent from my iPhone using Mustang Evolution
GHO5T5NIPER is offline   Reply With Quote
Old 03-09-2015, 10:06 AM   #11
Registered Member
Regular
 
GHO5T5NIPER's Avatar
 
Join Date: Sep 2012
Region: Kansas
Posts: 476
I should add I have bassani catted X and catback. Don't know if this could be a cat problem or not


Sent from my iPhone using Mustang Evolution
GHO5T5NIPER is offline   Reply With Quote
Old 03-09-2015, 10:11 AM   #12
Registered Member
Regular
 
fenixignition's Avatar
 
Join Date: Nov 2014
Location: Clearwater, fl
Region: Florida
Posts: 1,050
shouldnt be. unless its either clogged or broken and dangling from your headers.

reading back on that, it sounds like your fuel line isnt holding pressure. that happened on my old car, but it had to do with a line connected to its in-tank filter. if it only happened once, could have been a fluke. moisture in the line maybe, who knows. if it keeps happening when you shut the car of, but fixes itself right after, then it has to do with losing pressure in the line. i would say maybe the fuel pump didnt prime that one time, but the line should hold its pressure without needing to prime it for a good amount of time.
__________________
2002 GT 5sp. 16x,xxx miles
Steeda Exhaust, C&L plenum, BBK Throttle Body, Steeda Underdrive, Steeda short throw, unknown stage clutch. Rear main leak. Compressor seal leak. Steeda lower control arms. good tires.
fenixignition is offline   Reply With Quote
Old 03-09-2015, 12:15 PM   #13
Registered Member
Regular
 
GHO5T5NIPER's Avatar
 
Join Date: Sep 2012
Region: Kansas
Posts: 476
Quote:
Originally Posted by fenixignition View Post
shouldnt be. unless its either clogged or broken and dangling from your headers.

reading back on that, it sounds like your fuel line isnt holding pressure. that happened on my old car, but it had to do with a line connected to its in-tank filter. if it only happened once, could have been a fluke. moisture in the line maybe, who knows. if it keeps happening when you shut the car of, but fixes itself right after, then it has to do with losing pressure in the line. i would say maybe the fuel pump didnt prime that one time, but the line should hold its pressure without needing to prime it for a good amount of time.

Hmm well I burned that tank of gas that I first noticed it on and still doig the same thing on a different stations so ruled out bad gas. I'll have to check the pressure when it happens again


Sent from my iPhone using Mustang Evolution
GHO5T5NIPER is offline   Reply With Quote
Old 03-09-2015, 02:02 PM   #14
Registered Member
Regular
 
Panther140's Avatar
 
Join Date: Sep 2014
Location: xxx
Region: Other
Posts: 1,473
Could be a million trillion things man. You have EFI. Unless you wrote the code yourself and have it memorized, there will always be mystery.

Could be O2 sensor going out. Could be MAF. Could be PATS, Fuel pump, Fuel Relay, Coils, ECU, Short Circuit somehwere. Never know for sure.

Hence: The carburetor on my car
Panther140 is offline   Reply With Quote
Old 03-09-2015, 03:11 PM   #15
Registered Member
Regular
 
Join Date: Mar 2013
Location: Salinas
Region: California
Posts: 7,416
Yes.
Without a code, to point in the right direction, you will have to do a lot of random diagnostics to find the cause.
My car has been "hot-starting" strangely, about 10% of the time, for as long as I've owned it. It doesn't pop but it seems like it struggles to start. Recently, I had a difficult time starting it on a cold-start, after it had been sitting for a couple of weeks.
I'm suspicious that the fuel pump is getting weak, and I'm pretty sure that it is the original, so I already have a new one waiting to be installed.
straybullitt is offline   Reply With Quote
Old 03-09-2015, 05:39 PM   #16
Registered Member
Regular
 
fenixignition's Avatar
 
Join Date: Nov 2014
Location: Clearwater, fl
Region: Florida
Posts: 1,050
could even be something like a hot fuel pump relay. try to research what happens to different things when they are hot, and go from there. ive seen relays act weird when they get hot.
__________________
2002 GT 5sp. 16x,xxx miles
Steeda Exhaust, C&L plenum, BBK Throttle Body, Steeda Underdrive, Steeda short throw, unknown stage clutch. Rear main leak. Compressor seal leak. Steeda lower control arms. good tires.
fenixignition is offline   Reply With Quote
Old 03-10-2015, 09:25 AM   #17
Registered Member
Regular
 
Panther140's Avatar
 
Join Date: Sep 2014
Location: xxx
Region: Other
Posts: 1,473
Put a carb on it and an MSD CDI. Problem will be solved for cheaper and you know its not coming back. You dont actually even need the CDI. Its just nicer to tune the timing with. Your ECU will run it with a carb on if you unplug the EFI pump
Panther140 is offline   Reply With Quote
Old 03-13-2015, 05:01 PM   #18
Registered Member
Regular
 
GHO5T5NIPER's Avatar
 
Join Date: Sep 2012
Region: Kansas
Posts: 476
Ok so I just got a code that popped up. P0340 camshaft position sensor A circuit. After researching this code a bit I a lot of people have said it could be bad alternator. My speakers whine when I have the radio on and change pitch every time I push something that uses electricity like the windows and also changes pitch with engine speed. Could this also be why my car is backfiring on startups but runs fine any other time?


Sent from my iPhone using Mustang Evolution
GHO5T5NIPER is offline   Reply With Quote
Old 03-13-2015, 05:07 PM   #19
Registered Member
Regular
 
GHO5T5NIPER's Avatar
 
Join Date: Sep 2012
Region: Kansas
Posts: 476
Popping and stalling after warm startup

And now it also is popping and stalling (misfiring?) on startup a lot more often after seeing this code pop up.


Sent from my iPhone using Mustang Evolution
GHO5T5NIPER is offline   Reply With Quote
Old 03-13-2015, 05:30 PM   #20
Registered Member
Regular
 
GHO5T5NIPER's Avatar
 
Join Date: Sep 2012
Region: Kansas
Posts: 476
http://forums.anandtech.com/showthread.php?t=191636

This is exactly the problem I'm having


Sent from my iPhone using Mustang Evolution
GHO5T5NIPER is offline   Reply With Quote
Old 03-13-2015, 10:09 PM   #21
Registered Member
Regular
 
fenixignition's Avatar
 
Join Date: Nov 2014
Location: Clearwater, fl
Region: Florida
Posts: 1,050
Im almost sure i remember reading somewhere recently, someone had a code like that for a cam sensor and it ended up being a bad diode in the alternator. Try to go get it checked at advance or autozone. they can run a test on your battery, then have the car running and check the alternator output. there should be a thread somewhere recently in the 99 04 gt section.
__________________
2002 GT 5sp. 16x,xxx miles
Steeda Exhaust, C&L plenum, BBK Throttle Body, Steeda Underdrive, Steeda short throw, unknown stage clutch. Rear main leak. Compressor seal leak. Steeda lower control arms. good tires.
fenixignition is offline   Reply With Quote
Old 03-14-2015, 12:46 AM   #22
Registered Member
Regular
 
GHO5T5NIPER's Avatar
 
Join Date: Sep 2012
Region: Kansas
Posts: 476
Quote:
Originally Posted by fenixignition View Post
Im almost sure i remember reading somewhere recently, someone had a code like that for a cam sensor and it ended up being a bad diode in the alternator. Try to go get it checked at advance or autozone. they can run a test on your battery, then have the car running and check the alternator output. there should be a thread somewhere recently in the 99 04 gt section.

Well I recently checked the alternator while it was running with a multimeter and it read 14.5 volts which I think is normal? But speakers do whine and pick up engine noise so that may be it. Gonna pick up a cam sensor tomorrow and then if that doesn't work I'll look at the alternator


Sent from my iPhone using Mustang Evolution
GHO5T5NIPER is offline   Reply With Quote
Old 03-14-2015, 10:16 AM   #23
Registered Member
Regular
 
fenixignition's Avatar
 
Join Date: Nov 2014
Location: Clearwater, fl
Region: Florida
Posts: 1,050
Yea 14 is normal.butthats just the voltage. Id try to.have one ofthose stores check it for.free when you go get a cam sensor.

Sent from my LG-D800 using Mustang Evolution mobile app
__________________
2002 GT 5sp. 16x,xxx miles
Steeda Exhaust, C&L plenum, BBK Throttle Body, Steeda Underdrive, Steeda short throw, unknown stage clutch. Rear main leak. Compressor seal leak. Steeda lower control arms. good tires.
fenixignition is offline   Reply With Quote
Old 03-14-2015, 12:14 PM   #24
Registered Member
Regular
 
GHO5T5NIPER's Avatar
 
Join Date: Sep 2012
Region: Kansas
Posts: 476
Quote:
Originally Posted by fenixignition View Post
Yea 14 is normal.butthats just the voltage. Id try to.have one ofthose stores check it for.free when you go get a cam sensor.

Sent from my LG-D800 using Mustang Evolution mobile app

Alright I'll do that. Thanks for the help man. Would either the can sensor or a vac alternator cause the backfire and stall on startup? Or is that a whole different problem?


Sent from my iPhone using Mustang Evolution
GHO5T5NIPER is offline   Reply With Quote
Old 03-14-2015, 02:47 PM   #25
Registered Member
Regular
 
GHO5T5NIPER's Avatar
 
Join Date: Sep 2012
Region: Kansas
Posts: 476
Popping and stalling after warm startup

Ok so just replaced the cam sensor and it's still doing the same thing. Guess I'll go have the alternator checked


Sent from my iPhone using Mustang Evolution
GHO5T5NIPER is offline   Reply With Quote
Old 03-15-2015, 10:23 PM   #26
Registered Member
Regular
 
GHO5T5NIPER's Avatar
 
Join Date: Sep 2012
Region: Kansas
Posts: 476
Quote:
Originally Posted by GHO5T5NIPER View Post
Hey guys I just got finished with a 500 round trip to Kansas City and after stopping at a quick shop and turning the car back on the exhaust crackled a bit and popped on crank and then turned off. When I turn the key it immediately starts up without any problems. Only happened a couple times. Most of the time it's normal. Never had it on a cold start yet. What could this be? Have a Bama tuner, I know your guys opinions on them but any ideas?


Sent from my iPhone using Mustang Evolution

UPDATE: For anybody with this same problem in the future, it was the alternator. I guess a bad diode can throw off the cam sensor which causes the backfire on startups. I replaced cam sensor with no luck. Had alternator checked and diodes were bad. Replaced and runs flawlessly.


Sent from my iPhone using Mustang Evolution
GHO5T5NIPER is offline   Reply With Quote
Old 03-16-2015, 07:42 AM   #27
Staff
Regular
Staff
 
scottydsntknow's Avatar
 
Join Date: Apr 2013
Location: JB MDL
Region: New Jersey
Posts: 16,598
You can check the diodes with a multimeter yourself for anyone in the future searching this thread. Very easy to do yourself. Or just remove the alt and take it to AutoZone. Alt is so easy you can pull it in 5 minutes in the store parking lot if you only have your mustang as your driver.

Bad diodes will cause all sorts of freaky issues and the alt voltage will not give it away.

Sent from my VS985 4G using Mustang Evolution mobile app
__________________
2000 Mustang GT Steeda #0048

Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.
scottydsntknow is online now   Reply With Quote
Reply

Lower Navigation
Go Back   Mustang Evolution > 1979-2015 Mustang GT || Tech and Talk > 1996-2004 Mustang GT

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Warm to hot startup issue Jukens 2011-2014 Mustang GT 2 01-17-2013 11:12 AM
2006 GT Jumping forward after startup? ghst 2005-2010 Mustang GT 7 06-22-2012 11:53 PM
2nd gear popping popping out Cleancobra22 General Mustang Discussion 4 05-29-2012 09:36 PM
Runs good but stalls after warm start up Ironman121388 1979-1995 Mustang GT 4 04-07-2012 10:15 AM
stalling on startup Deadmeat101 Pre-2005 V6 Mustang 4 09-16-2003 08:00 PM

» Like Us On Facebook



10:02 PM


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0

MustangEvolution.com is in no way associated with or endorsed by Ford Motor Company.