Chugging Motor
 

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

IF you decide to fix it, consider letting me rebuild you an engine, I can do so for $1000 or so. Check out www.rotaryresurrection.com