Idle And Maf Issues, Ideas Anyone?

[liltrublsm]

Background: s13 blacktop in a 91 240sx. Freshly installed, never driven. Apexi AFC, rb25 maf

Two problems.
Without the maf: The engine tries to start, drops to 200 rpm, and then catchs when I press the gas. It will idle at 850 for about a minute, and then dies unless I keep my foot on the gas. What could be causing this?

-I have taken the intake manifold off and am looking at the aav. How
can you check if it is ok?

With the maf: Car will not idle. I know this is a maf problem. I have searched and havent found any specifc info on afc settings, besides that the rb25 maf is similar to the z32 maf. I have 3 volts coming in to the maf.

-What is the rb25 maf resistance supposed to be?
-Apexi AFC settings for the rb25 maf would be super.

[mr peas]

is this waaka waaaka man?

[liltrublsm]

ummmm, no.....

[mr peas]

oh my mistake :D

does your car behave the same at cold start and when its warmed up?

[liltrublsm]

I havent let it warm up very much...I dont want to blow anything up

[cfinch]

what is with everyone and the coolant temp thing! lol what a joke it took me 2 seconds to fix the "waaka wakka man's" car lol! what are your afc settings ? I dont know anyone with an rb25 maf so I dont know the exact settings. How did you come to your settings? wideband ?

[msaskin]

Originally posted by cfinch@Mar 29 2005, 12:26 AM
what is with everyone and the coolant temp thing! lol what a joke it took me 2 seconds to fix the "waaka wakka man's" car lol!* what are your afc settings ? I dont know anyone with an rb25 maf so I dont know the exact settings. How did you come to your settings? wideband ?
Everyone is excited over the coolant temp sensor because the ECU relies pretty heavily on it for fueling information. When I see a fueling problem I generally check MAF first, followed immediately by CLT sensor.

That all said, sounds to me like you've got the AFC hotwire values (IN/OUT values) configured wrong.

~matt

[mr peas]

I was actually just stalling until you guys saw the thread ;)

[bigmike]

Originally posted by msaskin+Mar 29 2005, 05:53 AM--></div><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td>QUOTE (msaskin @ Mar 29 2005, 05:53 AM)</td></tr><tr><td id='QUOTE'> <!--QuoteBegin-cfinch@Mar 29 2005, 12:26 AM
what is with everyone and the coolant temp thing! lol what a joke it took me 2 seconds to fix the "waaka wakka man's" car lol!* what are your afc settings ? I dont know anyone with an rb25 maf so I dont know the exact settings. How did you come to your settings? wideband ?
Everyone is excited over the coolant temp sensor because the ECU relies pretty heavily on it for fueling information. When I see a fueling problem I generally check MAF first, followed immediately by CLT sensor.

That all said, sounds to me like you've got the AFC hotwire values (IN/OUT values) configured wrong.

~matt [/b][/quote]
that was the same thing wrong with my car when I bought it, mess around with your hotwire settings until it will hold and idle then check everything over under the hood.

[liltrublsm]

http://www.240sxforums.com/forums/showthread.php?p=539749

This is where I am at so far. I am going to take the harness plug apart tonight.

I have already replaced the two pin coolant temp sensor. Can a one pin engine temp sensor from a sentra replace the one in the sr20?

I thought that output 6 was for an s14 sr20? Atleast that is what the Apexi manual leads me to believe. What would it be for an s13 sr20?

[liltrublsm]

Does anyone have a spare maf and plug I could borrow to troubleshoot?