Hey guys, new to the boards. I've got a dilemma!
Someone recently gave
me an 86 Bonneville. It'* one of the 4.3 liter models, and apparently rare, because it'* fuel-injected, and not carb. I'm wanting to fix it up into basically a new car, and it'* in great shape as it is, but I have one small problem.
For some reason, it doesn't idle correctly, and when running, it has a tendency to cut off. It'* like theres a spot in acceleration where it just bogs down. Trying to get away from a stop sign is also difficult. If it were a carb vehicle I would assume the carb needed a rebuild or something, but it'* fuel injected.
A mechanic I know was under the impression that the throttle body was bad. I didn't think that was it, but I went ahead and got one off a junker, cleaned it up and put 'er on.
So I started changing sensors. I've replaced the map sensor, the oxygen sensor, the air idle sensor, the thermal sensor that sits in coolant on the front of the engine, I've replaced all but one. It'* one that has been discontinued called a EGR control valve relay solenoid. I have tried every auto parts store in the town (advance, O'reilleys, napa, autozone, pontiac dealership) looking for it.
The only reason I know it exists is because I also replaced the EGR valve, and the heat sensor which connects to it. The Pontiac dealership I went to for help not only couldn't tell me what the part was called, but insisted there was no such thing as a fuel injected 86. I had to convince the mechanic on duty to actually check the computer, at which point he admitted he was wrong. Finding the part amounted to letting me look at an exploded diagram of the engine and identifying it by sight.
So after all this, the problem really hasn't changed. I have discovered it will idle correctly if warms up enough, but there'* still a spot in acceleration where it wants to die.
Most mechanics I talk to tend to believe the car doesn't exist or else are reluctant to work on it. The Pontiac mechanics couldn't give me any advice either. I'm sort of at my wits end at moment and quite honestly debating scrapping the whole thing and gluing a carb on it.
Anyway, has anyone heard of a fuel-injected 86? Does anyone have any ideas where the problem might lie?
Thanks in advance......