ahh i only have 1400 rpms help

[stephenp]

ok i tried swapping the maf with no avail (known good one ) inspected wiring to it look good can any body tell me the voltages i should begetting from what wires or whats what (grounds ohms tests what nots)
can anybody tell me how to diagnos the computer ( the vague description not alot off detail needed i lost my book and have only idle so i want to diagnosis the ecu help please)
do i have the key off or acc or in on pos.? off to begin with and switch to the onboarde
any suggestions would be awsome

[DeleriousZ]

maf should read between 0-5 volts..

http://www.gowhatnot.com/nissan/pdf/efec.pdf

for ecu diagnostic... or search the z31 section of zcar.com or z31.com for "ecu diagnostic"

search button is your friend

[stephenp]

tried the search thing and came up with buy this this is a scan tool buy this itll san your cars ecu buy this no thiis


thanks for the z31.com one forgot about them
just was wondering if somebody had simimlar problems


any idea as to what wire is the wire that would have the varying resistance?

thanks in advance
and thank\s for the help so far

[stephenp]

well i did the ecu diagnosis andit came back with air flow meter( i guess it is either in wiring or sensor sensor is doubtful replaced with known good), cylinderhead temp (better get that fixed also), fuel temp (oh you caught on that its not really 220 degrees), air conditioner (well i guess it makes sense since there isnt one) ignition signal(sorta baffling?), vehicle speed sensor, (well it also removed the speed limiter to remove the speedo sensor wire) and idle switch (there is no idle switch on it so i guess that makes sence) allthough im more lost about the other sensors (ok just the ignition signal, and head temp
and i guess ill put my new lead on the air flow meter and hope '

[stephenp]

ok actually i think that i found the prob... replaced wire rescanned ecu still nothing traced wire almost back to the ecu
figured just run new wire if no luck ill replace ecu with the non turbo ecu i got ... well found out i burned wiresd to my manifold hopefully i \replace them and it didnt injure my ecu thanks for the help

[stephenp]

ok i now have approx 3000 rpms......... what ....im lost if i hook up the idle circuit it revs higher... to many sensiors off for the ecu?????? lost anyt help wqould be loved

[Mr.INSANE]

I may not be to big a help but the ecu is probally retarding you engine to stop it from damaging itself thats what the ecu thinks but it could be a broken sensor

[stephenp]

well rehooked a few sensors and mind you ive been driving this for about 8000 miles on different head and block combos with no prob..
also i can check the ecu and it still comes up with the maf and the eng cyl. head temp and ign signal and also the ac but i dont havbe a head temp sens my old one is broke and other onew must be no good (on now) as for ac i donrt have it also i can change timing with no avail and very little diff. is noticed on the maf when i unplug (althopugh it does a small burp ) and also i can only use 1\4 throttle after i touch the idle swithc (tps)
????
going to let it run for minute and then go to a rural road and drive a mionute gety up to what ever speed i can in 5htn and trey and put it in a lower gear in highe rs and floor it .......... try mybe just my bwe


we already know it is not gonnas work.....

[stephenp]

i tried derasticly changinmg timimg to no avail
but any idea what i could do to fix that problem?????


also no i can go to approx 5000 rpms but the catch is the fact that it is at approx 1\4 throttlwe any passed it leans oiut and falls on its face


please help

[DeleriousZ]

try replacing the ecu.. might have cooked it when you shorted the wires against the manifold...

[stephenp]

ahh on that note none of the wires were burned through i dont even klnow if it was fresh burn scares could have been old battle woonds but

ahh can i swap in my 86 ecu or (na) or do the clips not line up..... or will that short something..
... i know outragouskly rich idle
try and run rich under anything except wot aftwer spool and that sorta thing but hey wheres the fun without a challenge..... heheheheh gulp