Question about 1986 Porsche 928

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928 s car has terrible mis fier cold worse warm alittle better

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Try changing gas. use 93 from mobile

Posted on Aug 06, 2011

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Have you checked for vacuum leaks? Poor idling when cold that gets better when the engine warms up, or at higher RPMs are symptoms of vacuum leaks. Check all hoses and connectors. If it's a manifold gasket, you will want to use a smoke machine (check when the engine is cold).

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You could look at the injectors as they fire. From cold to hot. They hit consistent so look at how they spray/pressure. Could be the fuel pump and or filter. I would replace the fuel filter and check pressure. The module in the distributor either works or doesn't. I can only think of two things that happens with heat(you replaced everything else) Fuel is one, the other is the spark plug wires. Route them away from any ignition or injector wires.

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Cold air getting in at the drivers right foot


That is typical for most cars. The front lower (foot area) vents allow cold air to come in just before the heater kicks in (heat value opens). If this just started, may be wait for a warm / hot day and see it continues. Sometimes people forget as this typically happen only on colder days. I wouldn't worry about it. To make it stop, turn off the heater - A/C and wait for the car to warm up before turning on the heater. The car is warm once the engine temp gauge starts to move up / show warmer. In most typical cars it takes about 5 to 7 minutes running get the engine temp up to a point where the heater will blow warmer air. If you have more details / concerns - post them, the more you include (car make, model & year, when did the problem start, anything make it worse or better, influencing conditions e.g. rain, cold, hot, dry, etc the better).

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BAD MIS


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the idle air control valve may be bad or just needs cleaned out. idle air control valve acts the same as a choke. if it is messing up it will cause engine not to run right.

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94 gran am was idealing fine then sputered alittle then dogged down then just quit i restarted it runs terrible no power sounds like it trys to run desent again but it doesnt any ideas, Broape


First Idea is fuel pump failed. You will ned to get a pressure test doen to be sure. Spray brake cleaner as its struggling to see if it idles and revs better. If it gets better then the pump has failed

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1 Answer

97 z-24 rough idol when cold/runs better when warm


The most common problem is a partially clogged injector. They should be cleaned about once a year. Also the coil housing is known for shorting out between cylinders on your engine. The reason that its worse with the AC on is because the AC compressor is adding a load to the engine. You should probably take it to the shop and have it diagnosed soon before the misfire damages the catalytic converter.

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