possibly bad afm????

337 Views 5 Replies 4 Participants Last post by NathanZ, Nov 17, 2001

Unknown User

Discussion Starter · Nov 16, 2001

i have a 77 280z 4speed. when i start it cold, it idles real low(round 400-500rpms) and under very light throttle, sputters a bit. but after it warms, runs good and idles steady at 700-800. now i thought that with FI, it would automatically compensate for the fresh start? it really seems to be running on carbs without a choke! or maybe it's that cold start or thermotime switch i keep hearing about. never have even looked at where those things are on the motor.

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NathanZ

· #2 · Nov 16, 2001

I have same problem!

Only mine is intermittent. It will happen exactly as you said, and goes away after the engine warms up a bit. Vacuum leak? Bad connector(s)? It did happen for the first time after I cleaned the motor with water and I undoubtedly got some connectors wet..... hmmm.
Nathan

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NathanZ

· #4 · Nov 16, 2001

Noise coming from that area:

I have noticed that when my car is completely warmed up and idling, that the air regulator, or something near it, makes a buzzing sound and vibrates (if you touch it, you can even feel it). Just to make sure, the air regulator is the thing with a hose going to the valve cover, and a connector on it right? Is this vibe normal? And what does the air reguator do?
Nathan

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NathanZ

· #6 · Nov 17, 2001

Thank you

I will be checking it soon!
Nathan

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