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GM Fan.
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May 28, 2024 at 10:01 am #815193
Dazedandconfused
ParticipantHere we go. 2002 Buick Century limited, 3.1 v6. Cars been sitting for a year or so. Last one to drive it parked it and said there was something going on with it. So, got it going and had no power upon accelerating and would making a squeeling noise when accelerator pushed. Sounded like a failing alternator but noise was coming from around water pump, so i just assumed and replaced water pump. Not the problem. Finally found it was coming from exhaust manifold ,had a blown gasket. Oddly it had 2 manifold bolts broken at front cylinder. Fyi there has been no codes during all this. Fixed the manifold problem. Started engine, no noise, threw code for egr. Dont recall code number. Cleaned egr, started engine code gone, new code appears P0300. Random misfire. Started pulling plug wires at coils (1 at a time) checking for spark. All seemed to be sparking but when i pulled wire from last coil on right it seemed to have much stronger spark and killed the engine. The engine now had trouble starting and ran rough.P0300 gone and now p1374? Which pointed to crankshaft poss. sensor3x. Seems to be sensor behind balancer although there are 2or3 of them. Now i’m not convinced this is the problem. I think i read this is the one for low rpm and idle. I can change it out but wonder if the other is bad since throughout all this it had no power to accelerate and would just bog down. This all seems crazy and i wonder if i should keep following along and change first sensor or maybe both or might you know of some other thing happening causing all these “bang your head on the wall” problems. I live on a fixed income and hate to spend unnecessary money. Any thoughts would be greatly appreciated
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May 28, 2024 at 11:42 am #815202
GM Fan
ParticipantUsually if its a top end acceleration issue then it spark related (but ive seen it with low fuel pressure too). If i were you id start by replacing the plugs and wires since they could’ve be fouled from the blown head gasket. If its still acting up and you dont see any damage on the engine harness, then id replace the crankshaft poss. sensor and then the coils. If the car was running lean then that couldve been the reason why it blew a head gasket (thats why its possible it could be fuel related and could even cause random misfires). So what i would do in order
1. Replace plugs, wires and fuel filter (maybe some fuel cleaner depending on how old the gas is)
2. Replace either coils and or crank sensor (Bad coils can send bad info to the bad crank sensor, you can test the coils with a multimeter)
3. Check fuel pressure with a gauge, if low fuel pressure (below 52psi) then replace fuel pressure regulator.
4. If the fuel pressure is still low then replace fuel pump.
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