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88 GT 5.0 STILL STUCK AT 3500 RPMS
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lpp5.0
Named my kid Carroll Shelby
| Posts: 53
| Joined: 05/08
Posted: 12/21/08
04:08 PM
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I have a stock 1988 Mustang GT 5.0 5-speed with speed density. I've changed the fuel pump, spark plugs, fuel pressure regulator, MAP Sensor and replace the distributor with a rebuilt one. Its getting fire to all 8 spark plugs but it still wont turn above 3500 rpms. All I can think of next is the ECM or the fuel injectors. Please help???????
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427SOHC
I grew a Turner ponytail
| Posts: 316
| Joined: 03/06
Posted: 12/23/08
07:10 AM
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Did you change the fuel filter? If yes, then it sounds like the factory rev limiter is going bonkers, so it could be a computer problem.
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lpp5.0
Named my kid Carroll Shelby
| Posts: 53
| Joined: 05/08
Posted: 12/23/08
09:39 PM
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I did change the fuel filter. Is the factory rev limiter built into the ECM?
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Posted: 01/24/09
08:41 PM
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have you checked your throttle position sensor? Thats where i would have gone if i would have found out my MAF wasnt the problem in my 91 LX
1991 LX Saleen kit, built motor, Cobra intake, 80mm MAF, MSD 6AL box, MSD Cap and Rotor, MSD Ignition coil, Ford Racing 9mm Spark plug wires, Pro5.0 Shifter, subframe connectors, eibach springs, solid motor mounts, shorty headers, Pypes O/R X-pipe, flowmaster super 44s, rear upper and lower control arms
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1sinful
Mustang IIs Rock!
| Posts: 6
| Joined: 01/09
Posted: 01/30/09
03:47 PM
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ya the rev limiter is in the ecm
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TrojanHorse
Mustang IIs Rock!
| Posts: 7
| Joined: 02/09
Posted: 02/01/09
06:30 AM
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If it is the computer, now is the time to convert it to Mass Air. That will pave the way for easier mods in the future.
Double check your timing and fuel pressure to make sure they are correct. If you don't already have one, pick up a Hayne's or Chilton's manual for your car.
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jump454
Mustang IIs Rock!
| Posts: 1
| Joined: 02/09
Posted: 02/14/09
03:44 PM
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check the plastic fuel lines for kinks or anything like that. when we pulled my motor someone wasnt watching them and they got pulled on. replaced them with a little piece of rubber hose and works well. also check the fuel pressure when its running and at 3500 and wont rev higher. if its a fuel problem the pressure should drop. and i dont think its fuel injectors cause i had 2 bum injectors and my car would still pull til like 5000 or 5500 rpm's. I can't rememeber.
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lpp5.0
Named my kid Carroll Shelby
| Posts: 53
| Joined: 05/08
Posted: 04/08/09
06:55 PM
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I tried a new TPS sensor and changed the fuel pressure regulator, still no difference. I pulled the ECM out, it appeared to be burned, replaced it with a new one-still no difference, also bought a rebuilt distributor-still no difference. I didnt spend very much money on these parts considering this is a 21 year old car.
Within the next month when I get up some extra $$$$$$ I'll bring it to the local Mustang expert and he's gonna connect a laptop to it and hopefully that'll tell the tale
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lpp5.0
Named my kid Carroll Shelby
| Posts: 53
| Joined: 05/08
Posted: 10/04/09
01:03 PM
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FIXED: REPLACED 2 BAD INJECTORS AND 2 STUCK LIFTERS
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