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Old 08-28-2012, 02:14 PM   #36
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Have u ever thought to change the temp sensors? I would check all 3 the 2 on the crossover and one which is the iat. If it starts messing up at normal temps then it may be related to one of those. Iat affect cause it reads temp of intake which does play a factor in o2 system as well as emission
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Old 08-28-2012, 02:47 PM   #37
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Quote:
Originally Posted by 1996mustang
Have u ever thought to change the temp sensors? I would check all 3 the 2 on the crossover and one which is the iat. If it starts messing up at normal temps then it may be related to one of those. Iat affect cause it reads temp of intake which does play a factor in o2 system as well as emission
Do you have a link to a picture of those crossover sensors? I'll check the temp sensor on the intake this afternoon.
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Old 08-28-2012, 08:31 PM   #38
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Ill take one for u now feom mine so u can see perspectively where they are on urs
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Old 08-28-2012, 08:44 PM   #39
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Re: Help!! 98 gt running poorly

I went underneath the car today and noticed there was an O2 sensor that was physically damaged. Replaced it to the tune of $56 at O'Reilly's and I so far have not had any codes. However, it still is skipping . I checked the readings of my IAT sensor against a temperature probe and it was right on the money.
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Old 08-29-2012, 09:38 AM   #40
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After u replaced the o2 sensor did u reset the computer so it could relearn itself?
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o/r x-pipe flow master 40 series dump downs, cai/ram intake, 75mm c&l throttle body and plenum, pi heads and intake swap, msd wires, stock gears, untuned at the moment, no dyno numbers for now.
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Old 08-30-2012, 06:35 PM   #41
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This sounds similar to a problem that I had on a previous car. So many codes and so much money lost replacing those parts. A friend suggested that I go to a salvage yard and get an ecu from another car just like mine. And to my surprise, it worked! It ran like a champ until I sold it. Maybe you can try that. It may remedy your problem.
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Old 08-30-2012, 10:41 PM   #42
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This sounds similar to a problem that I had on a previous car. So many codes and so much money lost replacing those parts. A friend suggested that I go to a salvage yard and get an ecu from another car just like mine. And to my surprise, it worked! It ran like a champ until I sold it. Maybe you can try that. It may remedy your problem.
I thought about doing that, but thought I would make sure it wasn't anything else. I replaced the fuel filter tonight, it's a wonder I've even been running since the fuel that came out of the filter looked like maple syrup. So far after that I've only got a p1151 pending that hasn't tripped the light yet.

---------- Post added at 10:41 PM ---------- Previous post was at 10:39 PM ----------

What the heck?! I closed the hood while the engine was running and the car stalled immediately!!! I cranked it back up an tried again and it did the same thing.
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Old 08-30-2012, 11:03 PM   #43
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Re: Help!! 98 gt running poorly

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I thought about doing that, but thought I would make sure it wasn't anything else. I replaced the fuel filter tonight, it's a wonder I've even been running since the fuel that came out of the filter looked like maple syrup. So far after that I've only got a p1151 pending that hasn't tripped the light yet.

---------- Post added at 10:41 PM ---------- Previous post was at 10:39 PM ----------

What the heck?! I closed the hood while the engine was running and the car stalled immediately!!! I cranked it back up an tried again and it did the same thing.
Thats strange. If you start the car with the hood shut, does it stay running?
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Old 08-31-2012, 06:51 AM   #44
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Maybe there is a loose cable or something. Or possibly......what i had happen to mine not with hood though but the harness that runs by the egr rube might have wires expose that short out the car and kill it. It happened to me befote on the highway taking a turn shut the car off. Started it up and ran fine but later on gave me issues blowing fuses and bustin my balls to figure it out till my girl pointed it out to me -_- shes a chevy girl lol
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Old 08-31-2012, 07:13 AM   #45
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@02 it starts fine. I've been driving it for months now and that's the first ive ever had problems.

@96 sorry about your girl lol. Mine would never let me live something like this down. I'm going to look for loose grounds tomorrow night.
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Old 09-01-2012, 05:25 PM   #46
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@02 it starts fine. I've been driving it for months now and that's the first ive ever had problems.

@96 sorry about your girl lol. Mine would never let me live something like this down. I'm going to look for loose grounds tomorrow night.
I was thinking maybe a wire was touching somewhere and shutting the hood caused it to short/ground and stall.
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Old 09-01-2012, 05:56 PM   #47
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Thats what i think. Check wires around the block behind the intake mani and maybe even on the rad suppprt as well. Ill show u were mine was touching that caused mine to die
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o/r x-pipe flow master 40 series dump downs, cai/ram intake, 75mm c&l throttle body and plenum, pi heads and intake swap, msd wires, stock gears, untuned at the moment, no dyno numbers for now.
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Old 09-03-2012, 08:20 PM   #48
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Ok. Maybe this is unrelated. I noticed today that at idle, my tps is reading at 17%. When I have just a little throttle it shows 40. Is there an adjustment to this little device?
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Old 09-03-2012, 08:30 PM   #49
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Usually no.......u can qouldnt recommend it maybe ur tps is goin out. Cpuld be very relative and possible its ur tps connectiin
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o/r x-pipe flow master 40 series dump downs, cai/ram intake, 75mm c&l throttle body and plenum, pi heads and intake swap, msd wires, stock gears, untuned at the moment, no dyno numbers for now.
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Old 09-03-2012, 10:15 PM   #50
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Quote:
Originally Posted by Eturner

You can save your beer money!.. Just get it running good!.. Try Seafoaming the F**** out of it!.. Other than that I'm out of ideas!..
Hahah seafoam does the wonders!
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Old 09-03-2012, 10:35 PM   #51
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Usually no.......u can qouldnt recommend it maybe ur tps is goin out. Cpuld be very relative and possible its ur tps connectiin
I read that you could adjust it on fox bodies. It's a brand new one though. I do know that when I put it on I had to twist it to get the slot to line up with the blade. It has an aftermarket throttle body on it.
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Old 09-04-2012, 04:35 PM   #52
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Its quite possible that twist u did might have screwed the tps. I would get a tps from a junkyard and try it on first. Cheap fix kinda but atleast would pinpoint it
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Old 09-04-2012, 07:19 PM   #53
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The only thing the twist should've done was line up the blade from the throttle with the slot on the tps.
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Old 09-08-2012, 03:33 PM   #54
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Ok. So I took it to the local stealership after hours (they're one of my company's customers,) and the guy told me he thinks that it's the good ole plastic intake. Something about it cracks in places you can't see and them causes air leaks.

So here is my question: is this a common issue, and if so, is there an upgrade/swap for the 2v 4.6?
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Old 09-08-2012, 06:54 PM   #55
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Ok. So I took it to the local stealership after hours (they're one of my company's customers,) and the guy told me he thinks that it's the good ole plastic intake. Something about it cracks in places you can't see and them causes air leaks.

So here is my question: is this a common issue, and if so, is there an upgrade/swap for the 2v 4.6?
Hey my wife's maxima did the same thing, but not cut off. The bottom of the intake(plastic part) had become brittle, allowing air to pass thru at the broken part instead of thru the filter and MAF. The car ran horrible and would nearly stall if driven fast and then come to a stop. RPM would drop to about 300. After replacing it with a new part that included the MAF, it was back to normal. While taking off the old intake, the brittle part just crumbled.

---------- Post added at 06:54 PM ---------- Previous post was at 06:53 PM ----------

Dude may be right.
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Old 09-08-2012, 09:11 PM   #56
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The strange thing is it runs worse when it gets hotter. And to add to it, when it's running rough, I can floor it and it goes back to normal.
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Old 09-08-2012, 10:18 PM   #57
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The strange thing is it runs worse when it gets hotter. And to add to it, when it's running rough, I can floor it and it goes back to normal.
Is a light on or any codes being given to help locate the problem. There are a number of things that could be causing your heartaches.
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Old 09-08-2012, 10:39 PM   #58
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Is a light on or any codes being given to help locate the problem. There are a number of things that could be causing your heartaches.
I have a p1151.
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Old 09-09-2012, 11:05 AM   #59
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I looked up p1151 and found this. Looks like a lot, but it really sounds like MAF sensor or bad injectors IMO. I hope this helps.

A code P1151 may mean that one or more of the following has happened:

ELECTRICAL:
Short to VPWR in the harness or HO2S
Water in the harness connector
Open/shorted HO2S circuit
Corrosion or poor mating terminals and wiring
Damaged HO2S
Damaged PCM

FUEL SYSTEM:
Excessive fuel pressure
Leaking/contaminated fuel injectors
Leaking fuel pressure regulator
Low fuel pressure or running out of fuel
Vapor recovery system

INDUCTION SYSTEM:
Air leaks after the MAF
Vacuum Leaks

EGR SYSTEM:
Leaking gasket
Stuck EGR valve
Leaking diaphragm or EVR
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Old 09-09-2012, 11:51 AM   #60
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Re: Help!! 98 gt running poorly

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Alright, so I have checked for vacuum leaks and leaks around the tb. I cleaned the MAF and Temp sensor last night, then cleared codes and went out. Checked the codes this morning and will list them below. I am getting about 18mpgs driving mostly highway. I sent AmericanMuscle.com an email about the MIL eliminators not working and hopefully they can tell me something. I wander if the o2 sensors are bad and the MIL elims are throwing it off worse. Its just driving me crazy! I found some high flow universal cats on amazon.com for $50 a piece. I may just buy those and get my local muffler shop to weld them in.

p0141
p0136
p1130
p1131
p1150
p1151
p1152
i missed this. disconnect the negative post on the battery for a few and reconnect it. that should fix it.
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Old 09-09-2012, 12:33 PM   #61
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I saw about the egr valve.. I thought I would try to unplug the vacuum lines going to it. When I unplugged it, there was no change in the drive ability. I also noticed a rattling coming from the drivers side of the engine upon acceleration. Amy thoughts?
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Old 09-09-2012, 02:40 PM   #62
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If the EGR valve is stuck open, it can cause all of the symptoms that you say your car is experiencing. I don't know about the rattling. Open the hood and accelerate to see if you can locate the rattle.
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Old 09-17-2012, 10:15 PM   #63
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Re: Help!! 98 gt running poorly

Ok guys... I feel like an absolute moron because how long this has been going on. These are the codes that I am getting on my software, and also a screenshot of my live data reading at idle speed during normal operating temps. I am not sure all of what I am seeing. Maybe one of you awesome guys will see something obvious

---------- Post added at 10:15 PM ---------- Previous post was at 10:13 PM ----------

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Ok guys... I feel like an absolute moron because how long this has been going on. These are the codes that I am getting on my software, and also a screenshot of my live data reading at idle speed during normal operating temps. I am not sure all of what I am seeing. Maybe one of you awesome guys will see something obvious
Sorry, broken image links. This is a link to the PhotoBucket album Mustang pictures by crains00 - Photobucket
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Old 09-17-2012, 10:49 PM   #64
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If thats at idle ur idling too high 1600 rpms is kinda high for normal idle. And tps at 16% open doesn't seem normal. Im sure someone will chime in on this soon

---------- Post added at 11:49 PM ---------- Previous post was at 11:30 PM ----------

If you haven't done this yet buy some carb cleaner and clean the maf sensors. Let it dry completely and then tey to run the car. It seems to me it may be a faulty maf sensor......junkyard that ish lol. Thays what i did was go to a jy and find one. Nake it a five finger discount
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Old 09-18-2012, 07:05 AM   #65
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The one where it shows 1600 isn't the idle. That's just what the car was doing when it called the fault code. The bigger pic (that shows the whole desktop) is at idle.
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Old 09-18-2012, 09:16 PM   #66
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Re: Help!! 98 gt running poorly

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The one where it shows 1600 isn't the idle. That's just what the car was doing when it called the fault code. The bigger pic (that shows the whole desktop) is at idle.
I also have a .csv with a data log from a 10 min drive around 50mph if anyone wants to read it. If you want to look at it, i'll email it to you.

-Edit-

I also am curious if it has something to do with the EVAP system since I am hearing a lot of hissing from that side of the car whilst driving.
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Old 09-18-2012, 10:14 PM   #67
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Have u looked at your evap canister yet?
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Old 09-18-2012, 10:25 PM   #68
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Have u looked at your evap canister yet?
I tried, and without trying to quote U2, I still havent found what I'm looking for. I've found hoses that go into the fender but I don't see the canister
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Old 09-19-2012, 12:02 PM   #69
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U have to remove the fender the canister is right behind the passenger fender
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Old 09-24-2012, 07:07 PM   #70
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Ok. Lets just start it over here. The symptoms have changed since I have been monkeying around with it.

Symptom: Rough idle and poor drivability at normal operating temps. The skipping and other things it does whilst cruising can be temporarily stopped by going to wot.

My scanner shows P1150 P1151 and P0136. I have normal fuel pressure and vacuum readings. The codes state it is running lean,however when the car is idling rough, the smell of fuel will dang near knock you out.

I have replaced:
the bank 1 O2s
Coils
Plugs/plug wires
Maf
Fuel filter
Tps
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