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Re: Black smoke and recurring p1171 p0171 Posted by SWEDECAR [Email] ![]() ![]() ![]() In Reply to: Black smoke and recurring p1171 p0171, Heather, Tue, 31 May 2005 08:33:18 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Very difficult.
As you state in the beginning, 4 "good mechanics" have thrown parts at the car without fixing the problem so they just give up.
Why do you call them good?
No, I can't give you the final solution that will fix your car but you need to find a mechanic that instead of just changing parts, actually test different things so that he/she can narrow it down to the real problem.
I would have to start from scratch and check the cylinder compression first of all, and then the fuel pressure and volume.
Check for air/vacuum leaks around intake manifold area.
Check opening times of fuel injectors, it should be around 3.2 to 3.6 ms at idle on no load on the engine.
Check air mass intake using the Tech 2 scanner.
Check the front and rear oxygen sensor and how they are working right after all fault codes has been reset.
Check the fuel pressure regulator so it doesn't leak raw fuel through the vacuum hose.
Check all related ground connections for the fuel system.
In the end your car might have a bad fuel injection computer but is usually the last part that gets replaced since you need to test and rule out everything else before that one is changed and they don't really have a history of going bad either.
Anders
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