my fiances 91 325i has always had this weird problem. it goes from about 600 rpm to 900 rpms, but about the half of the time, it idles right. so thats what canceled the ICV out to me. my guess would be injectors, spark plugs, alternator/belt, valve adjustment or maybe even timing belt? like i said about half the time it will idle normally, but until the engine is perfectly at the half way mark on the temp gauge it idles funky. let me know what you guys think. thanks.
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Originally posted by brandondan1 View PostMy 87 used to surge like that when it was running lean. AFM usually makes a big difference. Blue coolant temp sensor good? I have a good condition ICV that you can try as well.
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Intake leak, sticky ICV, or bad engine temperature input to the DME are the most likely causes. The ICV may not be dirty enough to affect operation once the engine is hot, but when the engine and ICV are cold oil in the ICV will be more viscous and may cause problems.The car makes it possible, but the driver makes it happen.
Jim Levie, Huntsville, AL
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You can see the temp sensors on the thermostat housing if you look from the passenger side. The brown one is for the cluster gauge, while the blue one is for the fuel injection. The last one I had was corroded as hell, so u might want to unscrew it and check, as well as measure the resistance if it looks fine.
Might wanna clean the ICV just in case, as well as check if your intake boots have any cracks. The small vacuum hose from the FPR to the manifold could be deteriorated. The breather hose at the top left corner of the valve cover could also have some cloggage, or be defective.Last edited by brandondan1; 01-24-2008, 09:56 AM.
91 318is
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Originally posted by rmousir View PostMight wanna clean the ICV just in case,
What is that and how do I check it?
Thanks.
91 318is
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How can you tell if your ICV is good or bad? I cleaned mine, and it buzzes when the key is on, but I did the check recommended in the Bentley, where you get the engine to operating temperature, shut it off, and then turn the key back to the on position. The ICV is supposed to open half way. Mine stayed shut, and if I disconnected it, opened it by hand, and then plugged it back in, it snapped all the way shut again. Does this mean its bad?
My fast says: traction control is for the faint of heart :evil:
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