Hey all,

If I rev to over 2k it cuts out and drops down to near death and then (sometimes) returns to 900 idle. It also takes a few tries to get it started.

It just started doing this and isn't drivable because of it. Last week it cut out a couple times but drove fine afterwards.

I'm guessing this is an ignition system problem. Could it be anything to do with my fuel pump/filter?

What are my best bets to check?

Thanks for any info.

 

air flow meter's about to die, replace it and come back.

 

Is there any way to check the afm without replacing it? I wan't to make sure thta's the problemo before replacing it.

 

read the stickies..

 

my car did this, adjust the idle speed closer to arround 1k and see what happens.

i dont know what the nominal idle speed is in this car but it fixed my rev problem

 

according to FSM idle speed is 700 RPM + or - 100 RPM
Haynes I believe says 750 RPM + or - 100 RPM

But generally around 700-800 is the normal idle

 

Your TPS (Throttle Position Switch) is wet... This is the MOST common 280ZX issue in history and has been covered well here. the "Search" feature is your friend.

Remove the plug from the top of the TPS and dry out the contacts on the TPS and the plug (Compressed air works great if you have some.) Spraying electrical contact cleaner is a good idea also.

This usually happens after:

A: Getting the bright idea to wash your motor and engine compartment.

or

B: Leaving the hood up before it rains...





Rod.

 

yeah ^^^ that or the AFM connector. both will cause this problem.

 

hrmm, if my idle speed is 1000 my air regulator isnt working then, because come to think of it its always 1000!

now i have dropped the idle speed to 800 when its warm and it doesent dip...hrmm regulator's are expencive

 

i got like... 2 extra lying around... air regulators.... if your interested.

 

lemme poke at mine and make sure its truly ded then i'll let you know

 

ok so when it was cold i wacked it with a screw driver and the RPM went up a little but but i was un able to adjust the idle speed, then when it warmed up the idle speed went even further up so i adjusted it down to about 725RPM, that was at about 3pm, i drove arround town untill about 4:30 pm i went to check it and it kinda dips a little but its at 725 rpm still but it wasnt completely cold.

when its cold when i move the adjustment screw the idle shouldnt change right?

 

it will always change if everything is hooked up right.

 

eh, i'll check it out later tonite and see, i may need to pop it off and hose some WD-40 in there or something.

300zx/maximas have a similar device only when its cold you cant adjust the idle speed very much, alot of turning only gains or loses a few RPMs but theres a way to fix them when they go bad:
http://www.cardomain.com/ride/309614

some one mensioned some place else new reg's have an adjutment screw, was that 280's or 300's?

 

Yep -- was the afm

Cleaned it out and moved the circuitboard up a bit and now the car runs 20000% better!

While it was off I noticed a **** load of gunk inside the intake manifold -- what's the best way to clean it up a bit without pulling it off? (all my vacuum lines will die if touched)

 

run carb cleaner and seafoam through it at the opening (infront of the TB) and through some vacumme lines.


oh... and... I WIN!?!??? i think? did i wind this time guys?

 

no i won..................again

 

no you said replace it. i dont think you can take the glory this time....

 

alright i am stumped, the car is supposed to run a little higer rpm untill it reaces X degrees and then its supposed to drop to ~750rpm right?

or does ti run at X ammount of RPM all the time hot or cold?

 

NA's have a cold start valve, not a fast idle like the turbo cars.

 

oh ok, i was thinkin it idles up untill warm and then dropped, my haye says it does but then again theres its been fixed and ammended more than once.

so funky regulator thing same idle hot and cold, cold start valve

these cold start valves would be good for potato cannons!
forza time

 

replace it, rebuild it, it all had the same outcome.

 

lol ^^^^


w/e. cleaned it though fyi

 

ok so i poked, the flappy thingy inside was sticking when it would get hot and not move so i poked and wiggled and hosed it with WD-40 and it seems to be good now. i bent the tabs on the connector to get a better connection but i have yet to find any crusty green connections.

my idle isnt steady any more but mabe now that something workin its time to re adjust or something else needs poking