Need some guidance - Mustang Evolution

Go Back   Mustang Evolution > 1979-2015 Mustang GT || Tech and Talk > 1979-1995 Mustang GT



Reply
 
Thread Tools Search this Thread
Please support our sponsors and let them know you heard about them here!
Old 04-27-2013, 03:08 PM   #1
Registered Member
Regular
 
89notchbeast's Avatar
 
Join Date: Feb 2013
Location: Also
Region: Illinois
Posts: 32
Need some guidance

Ok...I've had this 89 for a couple of months now...it's always had idle problems from the get go...it's got a bit of mods...373 gears , gt40 heads and intake , msd ignition , b&m short throw , cam ....always had to give it a little gas to keep it from dying the first start of the day...after that it would start right up...surging at idle has always been an issue and bucking while driving....replaced tps , mass air , timing chain , and got it timed.....now it starts right up but still fluctuates 700-3000 rpms at first then 700-1500 after it warms up also no vacuum leaks...only codes the car had were tps and mass air ...any suggestions?
89notchbeast is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 04-27-2013, 03:30 PM   #2
Registered Member
Regular
 
Dion11197's Avatar
 
Join Date: Mar 2011
Region: Texas
Posts: 829
Have you checked the idle air control valve?
Dion11197 is offline   Reply With Quote
Old 04-27-2013, 05:06 PM   #3
Registered Member
Regular
Supporter
 
93slowstang's Avatar
 
Join Date: Jan 2011
Location: Walker
Region: Louisiana
Posts: 3,436
You may need to set your idle and tps. There is a sticky in the useful info for it.
__________________


93 GT with more junkyard mods than you can imagine.
90 GT bone stock down to the air filter, awaiting restoration.
Join Mustang Evolution today. Click here
93slowstang is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 04-28-2013, 10:22 AM   #4
Registered Member
Regular
 
89notchbeast's Avatar
 
Join Date: Feb 2013
Location: Also
Region: Illinois
Posts: 32
No already done that 99v at like 900 rpm ...

---------- Post added at 10:22 AM ---------- Previous post was at 10:21 AM ----------

Yes the iac is brand new and working
89notchbeast is offline   Reply With Quote
Old 04-28-2013, 10:48 AM   #5
Registered Member
Regular
 
89notchbeast's Avatar
 
Join Date: Feb 2013
Location: Also
Region: Illinois
Posts: 32
I'm gonna change the fuel filter and try some sea foam .....this week see if it helps any
89notchbeast is offline   Reply With Quote
Old 04-28-2013, 01:07 PM   #6
Registered Member
Regular
 
rick9550's Avatar
 
Join Date: Jan 2013
Location: Dallas
Region: Texas
Posts: 200
You have an aftermarket throttle body?

I know the computers were different but...my 95 GT had surging issues after heads, intake and cam swap. Ran like a beast at WOT though so my area of contention (see what I did there? ) may not be the same. anyways I thought I would share.

Had my friend the Ford mechanic look at it. He had just done basically the same swap on his 94 GT but didn't have the surging issues.

He just backed out the, what looked like, the idle air screw on my BBK throttle body and it cleared it right up. I know on the stock throttle bodies there is no screw in this spot. That's why I ask if you have an aftermarket TB.

Just a thought before running sea foam through the car.
__________________
2011 GT Premium Black on Black, Eibach Sportline, Eibach Camber Bolts, BMRAdjustable Pan-hard bar, 19 x 9 Replica Boss 302 Laguna Seca, 275/35-19, GT/CSFront Fascia, C&L CAI, SCT SF3 w/ Bama Tune, Bassani Axle backs.
rick9550 is offline   Reply With Quote
Old 04-28-2013, 04:49 PM   #7
Registered Member
Regular
 
89notchbeast's Avatar
 
Join Date: Feb 2013
Location: Also
Region: Illinois
Posts: 32
I think I'm gonna try adjusting the idle again ..thanks...I just brought it to a shop and they couldn't fix it ...lol...that's who changed the mass air...they said give the computer a week to adjust...hahaha...bowl ****!
89notchbeast is offline   Reply With Quote
Old 04-28-2013, 05:20 PM   #8
Registered Member
Regular
 
89notchbeast's Avatar
 
Join Date: Feb 2013
Location: Also
Region: Illinois
Posts: 32
Ok...adjusted the idle ....running better but still not right ...best I could get it was 900-1000 rpms at 1.12 volts....98-99 volts runs bad
89notchbeast is offline   Reply With Quote
Old 04-28-2013, 10:50 PM   #9
Registered Member
Regular
 
Krazy Horse's Avatar
 
Join Date: Jul 2012
Region: Alabama
Posts: 178
Sounds like you need a tune. SCT Bama chip with a list of your mods to them when you order it. Best bang for your buck at this point if you want it to behave while driving on the street
Krazy Horse is offline   Reply With Quote
Old 04-29-2013, 03:45 PM   #10
Registered Member
Regular
 
89notchbeast's Avatar
 
Join Date: Feb 2013
Location: Also
Region: Illinois
Posts: 32
The only thing I haven't changed is the EGR valve .....could it be that?
89notchbeast is offline   Reply With Quote
Old 04-29-2013, 05:12 PM   #11
Registered Member
Regular
 
rick9550's Avatar
 
Join Date: Jan 2013
Location: Dallas
Region: Texas
Posts: 200
Quote:
Originally Posted by 89notchbeast View Post
The only thing I haven't changed is the EGR valve .....could it be that?
I wouldn't think so. You could just disconnect it or cap it off and see if that changes anything. Did you replace the PCV valve too?
__________________
2011 GT Premium Black on Black, Eibach Sportline, Eibach Camber Bolts, BMRAdjustable Pan-hard bar, 19 x 9 Replica Boss 302 Laguna Seca, 275/35-19, GT/CSFront Fascia, C&L CAI, SCT SF3 w/ Bama Tune, Bassani Axle backs.
rick9550 is offline   Reply With Quote
Old 04-29-2013, 05:58 PM   #12
Registered Member
Regular
 
89notchbeast's Avatar
 
Join Date: Feb 2013
Location: Also
Region: Illinois
Posts: 32
I will look into Pcv tonight ...how do I test it?
89notchbeast is offline   Reply With Quote
Old 04-29-2013, 08:18 PM   #13
Staff
Regular
Staff
 
scottydsntknow's Avatar
 
Join Date: Apr 2013
Location: JB MDL
Region: New Jersey
Posts: 16,610
You said you have a cam? What you describe is classic E cam and that is the cam that most ppl put in a stock headed motor who don't know any better. Honestly, if you put a cam into a stock headed 5.0 you're either going to lose power or just move the power band up a little. A custom dyno tune will help if you've got a cam but at $600 just to get the idle tuned... I'd throw a stock cam back in there, get my stock driveability back and call it a day unless you are going to do the heads/intake in the near future.
scottydsntknow is offline   Reply With Quote
Old 04-29-2013, 08:21 PM   #14
Registered Member
Regular
 
89notchbeast's Avatar
 
Join Date: Feb 2013
Location: Also
Region: Illinois
Posts: 32
Thanks .... Dyno tune it is....I do plan on twisted wedge and trick flow
89notchbeast is offline   Reply With Quote
Old 04-30-2013, 01:49 AM   #15
Registered Member
Regular
 
LightningR's Avatar
 
Join Date: Aug 2011
Region: Idaho
Posts: 21
I know this sounds funny but you may just rotate your mass air meter in slight increments in either direction.
LightningR is offline   Reply With Quote
Old 04-30-2013, 07:01 AM   #16
Registered Member
Regular
 
rick9550's Avatar
 
Join Date: Jan 2013
Location: Dallas
Region: Texas
Posts: 200
Quote:
Originally Posted by LightningR View Post
I know this sounds funny but you may just rotate your mass air meter in slight increments in either direction.
Yep. Good call. Forgot about that one.
__________________
2011 GT Premium Black on Black, Eibach Sportline, Eibach Camber Bolts, BMRAdjustable Pan-hard bar, 19 x 9 Replica Boss 302 Laguna Seca, 275/35-19, GT/CSFront Fascia, C&L CAI, SCT SF3 w/ Bama Tune, Bassani Axle backs.
rick9550 is offline   Reply With Quote
Old 04-30-2013, 02:51 PM   #17
Registered Member
Regular
 
89notchbeast's Avatar
 
Join Date: Feb 2013
Location: Also
Region: Illinois
Posts: 32
Thanks lightning I'll give it a try....funny thing is at one point I had it running perfect at 1100 rpms and when I changed mass air and tps I couldn't get it back
89notchbeast is offline   Reply With Quote
Old 04-30-2013, 09:52 PM   #18
Registered Member
Regular
 
89notchbeast's Avatar
 
Join Date: Feb 2013
Location: Also
Region: Illinois
Posts: 32
Turn the whole mass airflow unit body and all or do I have to take it apart?
89notchbeast is offline   Reply With Quote
Old 05-01-2013, 06:19 AM   #19
Registered Member
Regular
 
Dion11197's Avatar
 
Join Date: Mar 2011
Region: Texas
Posts: 829
If I remember correctly it's the whole unit. Just turn it in small increments to see if it corrects itself.
Dion11197 is offline   Reply With Quote
Old 05-01-2013, 11:03 AM   #20
Registered Member
Regular
 
89notchbeast's Avatar
 
Join Date: Feb 2013
Location: Also
Region: Illinois
Posts: 32
Thanks ...I will try it and let you guys know
89notchbeast is offline   Reply With Quote
Old 05-01-2013, 11:50 AM   #21
Registered Member
Regular
 
DustyStang306's Avatar
 
Join Date: Feb 2013
Location: Belleville On
Region: Canada
Posts: 342
You don't need a dyno tune with that set up my stock a9l runs my 306 with edelbrock heads an a x cam just fine an the first start up I used the stock 19# injectors before an idled fine The a9l computer take very well to mods an doesn't need a tune until you go with boost until then you should be fine with the stock computer doing its job fine. do you have the stock injector or do you have 24# injectors?
DustyStang306 is offline   Reply With Quote
Old 05-01-2013, 05:35 PM   #22
Staff
Regular
Staff
 
scottydsntknow's Avatar
 
Join Date: Apr 2013
Location: JB MDL
Region: New Jersey
Posts: 16,610
I had a HCI car with a A9L and it benefitted greatly from a tune.
scottydsntknow is offline   Reply With Quote
Old 05-01-2013, 07:57 PM   #23
Registered Member
Regular
 
89notchbeast's Avatar
 
Join Date: Feb 2013
Location: Also
Region: Illinois
Posts: 32
Will be back later tonight with more info..need to see what motor I have in it....I might be setting everything for regular 302 when it might be a cobra/explorer because the deck lid is about 11/2 2 inches higher than normal....couldn't fit a stock hood on it
89notchbeast is offline   Reply With Quote
Old 05-01-2013, 09:23 PM   #24
Registered Member
Regular
 
89notchbeast's Avatar
 
Join Date: Feb 2013
Location: Also
Region: Illinois
Posts: 32
Turning the mass air really works....don't know if its good enough yet but seems to be holding a steady idle and jerking is very minimum... I'll let you guys know tomorrow ....thanks
89notchbeast is offline   Reply With Quote
Reply

Lower Navigation
Go Back   Mustang Evolution > 1979-2015 Mustang GT || Tech and Talk > 1979-1995 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


» Like Us On Facebook



04:16 AM


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.