I have tried quite a bit now to solve my chugging issue on low rpm. The car just chugs and may die. So I swapped computers, afm, tps and checked the timing, ignition etc. I am now thinking that the fuel pressue regulator is not working. Reted told me a while back that if I do not get an aftermarket FPR since I put the walbro in that my stock FPR would go bad. I think that this would explain how the higher you rev the motor the better it sounds. Letting off of the gas is fine in higher RPM's. There is a bad stinch of gas as well. Opinions please I cannot think of anything else to check besides this. I will probably just go buy an aftermarket FPR to try but all info is appreciated. My mods are below.

Thanks

 

Verify fuel pressure with a gauge. But it certainly sounds plausable that is the cause.

 

Define chugging...

How does it start up?

Maybe run a compression check, then check your injectors and wires, FPR, and TPS. I have seen a TPS go bad and make the engine cut to one rotor at various throttle positions.

IM guessing by chugging youre talking about rough running. Does it start and idle like a lawnmower? That is an indicator of running on only one rotor, be it due to compression loss, a bad fuel injector or trigger wire, etc.

 

Define Chugging, I am not sure how to define it. When you try to let the car idle it chug, chug, chugs itself until you get to higer rpms say between 4-5 and then life is well. It all happened between me going into work and coming back out to go to a meeting and when I turned the key this started happening. The car was running perfect before I got out to run into work. Also I had the Fuel Injectors cleaned and blue printed less than 5k ago. The spark plugs are new the wires are new. I have tested the wires, coil, tps, etc. I would think that if the FPR is bad that this would happen to the car. I pulled the vac line off of the regulator and there is no gas in it. I have done this since the first post. So now I don't think it is the FPR. What about the pulsation damper? Any ideas there?

 

check compression. btw a FPR can go bad and not leak any gas anywhere. Maybe obtain another one from somewhere and try it. I have seeon one or 2 go bad...

 

what is a good compression number with a piston compression tester? I know that I could search for this but we are on the topic now.

 

Kevin, I found a great post that you did for compression. I am going to try that tomorrow and I will post the results.

 

Do a compression test. You are not really looking for specific numbers, more like 3 even bounces per rotor. But it really does sound like internal engine trouble.

 

well you guys were right the rear rotor is shot..........back to the drawing board

 

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