01 Idle still erratic- Dealer BS- What next?

[Dansmaxima]

Thanks for all the help regarding my erratic idle. I took the car to A Nissan Dealer today and paid $104 to hear something I already knew. I thought their scanner might find the actual problem. They said they have to replace the iac and mafs before they can diagnose the problem. Service manager said the aic's had a tendency to short out due to leaking coolant in the throttle body, which shorts out the computer. Sounds like a crock of **** to me. I had the throttle body off and there is no coolant leak, I know what everything looks like. It idles too high cold, then cycles rapidly when it warms up. If it is cycling between 1200-1600 rpm, doesn't that indicate that the iac is working?? My question is: I'm willing to get a pricey new iac and mafs. This will set me back $400 for another shot in the dark. Dealer wanted twice that for their parts. Any recommendations where to send for these parts online??? Thanks again!!! Dan

[Sentientbydesign]

Why can't they test the parts?

I love how these guys are trained to work on our cars but can't troubleshoot work a #$%^

[Dansmaxima]

And why can't I test the parts. My old iac motor has a resistance test I found in the factory manual- the ohms were out of spec, so I got a junkyard one, which tested ok as far as resistance . Now the dealer tells me it's bad, so I go to return the junkyard one under their 30-day guarantee. The guy refused to give my money back. Don't know how to test the mafs. I just sent away for an iac and mafs. Will keep you posted and I just want to get my best car back on the road.

What a crock-- 'we can't diagnose your car until we put in some absurdly overpriced dealer parts, and then we'll sell you a new ecu too.'

[Ketchup83se01]

i'd put my money on the iac if your maf went out the car wont rev at all, you can also disassemble your intake, wet a rag with carb cleaner and clean inside the throttle body, it might help if you've never done it

[Dansmaxima]

IACV-AAC valve is on its way. Thanks, I had the whole intake system off, throttle body off for cleaning. MAFS will be replaced also. Parts were the best price I could find from a place called rockauto.com. I need to study the factory manual more thoroughly. My Dealer experience sucked, maybe I expect to be ripped off on some subconscious level. I get different opinions- I heard if the MAFS is bad it won't rev over 3500rpm, and the computer goes into fail-safe mode. Gotta go to work painting a millionaire's trophy shore house until my parts come in........

[Sentientbydesign]

i'd put my money on the iac if your maf went out the car wont rev at all, you can also disassemble your intake, wet a rag with carb cleaner and clean inside the throttle body, it might help if you've never done it

Yeah, a little searching and reading the 240 guys threads showed that if the MAF is completely dead then it will go into safe mode with limited RPMS and very limited fuel.

[Dansmaxima]

I installed the new iav valve and mafs sensor. Really happy with rockauto.com so far. Good prices and service. There is a way to 'learn' the idle by disconnecting the TPS brown connector for a second. I did this. Now the car seems to have been repaired! The idle is now down to specs, even though the car did the same erratic revving after I installed the new parts.Idle did go down too far in drive on my first test drive. Seems Ok now. Page EC-123 tells how to reset the TPS idle memory by turning the ignition on for 5 secs and off for 10 secs, 20 times. Should I do this too?

Nervous about this car and ready to sell it and get an antique car that I can fix without a 200 IQ and an engineering degree.....

[Dansmaxima]

I meant iacv-aac of course. Off to return the MAFS core and get the $50.