86 na 944 Horrible Idle, Dies when given gas
11-21-2003, 09:26 PM
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7th Gear
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86 na 944 Horrible Idle, Dies when given gas
For the last couple weeks I have noticed that when I gave my car gas it would sort of chug and then take off alright. If I lightly applied the accelerator it would be fine but whenever I would tromp the gas it would stumble... at any rpm. I thought it somewhat strange, but didn't have time to get it checked out. I went on a shopping trip about 30mins from home. It drove fine all the way there except for the previously mentioned stumble. After being in the store 15 - 20 mins I came out and started the car. It cranked fine, but when it started it was idling terrible (around 600- rpms) I gave it some gas and it promptly sputtered down and died. I tried to start it a couple times with the same results. Anyway I got it towed to a shop near my home and they said it needed a new fuel pump. So I ordered a new fuel pump and fuel filter. They put that on with no change in the symptoms. Actually right after they put the fuel pump on it started alright and ran for a little bit and then all of a sudden reverted to the bad idle and dieing when given gas. I am at a loss of what to do. I was wondering if the fuel pressure regulator could be the problem? If so, is there a way I could test it myself? My Haynes manuel mentioned something about clamping the fuel pressure line to increase pressure. Any help you all could provide would be greatly appreciated.
11-21-2003, 09:33 PM
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Bunny with a Mission
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My 84 had something like that happen leaving work one day. A vaccuum hose came loose but I cant for the life of me remember which one it was. You might try looking at least, its usually the most simple things that local shops tend to overlook.
11-22-2003, 12:38 AM
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SOunds like it could be the FPR. The FPR opens to return gas to the tank when the pressure in the rail is high. If the pressure in the rail is too high, more gas will be injected than required and the engine will flood. If its too low, the engine will run lean.
The only real test is to check the pressure with a gauge. The good news is that FPRs are relatively cheap and easy to replace.
The only real test is to check the pressure with a gauge. The good news is that FPRs are relatively cheap and easy to replace.
