I can let it idle all day and won't get the code but less than a minute after it's rolling check engine light (code25) any ideas would be helpful.I've replaced the MAT sensor and checked the wires runnin' to it.
BD3


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86 IROC mods:retro-fitted to a Comp Cams 210-215 499/499 112 roller cam,T.E.S.,Hooker Aerochamber catback
T.P.I.S. airfoil,Dan Burk ported intake system,,March
pulleys,Accel 8.8wires,ign.mod,Crane PS-91 coil,Crane HI-6S ign.box
RAM AIR induction,gutted MAF,
B&M shift kit,3.73 rear gears,Accel afpr,Hypertech stage 2 chip,Random Tech.cat.,Lakewood lower control arms,Lakewood adj.panhard rod,mac subframe connectors,PST polygraphite bushings 14.281 @ 95.45 2.004 60' on street tires
"The more I learn about women,the more
time & money I spend on my IROC"

[This message has been edited by IROCZ4BD3 (edited November 05, 2001).]

 

well, i may not be able to solve it, but here is more info on the sensor, it wont throw a code until you are moving, at any speed.

heres how to check it.
disconnect MAT sensor
turn ignition ON, engine off
check voltage between MAT sensor harness terminals using a voltmeter.
you should of over 4 volts if not then you have a wire that is grounded
if its over 4 volts then check the resistance across MAT sensor Terminals, should be more then 185 OHMS.

heres a chart.
----*F-------OHMS
----100------185
----70-------450
----38-------1600

the code also sets if u have temp of over 302*F
also, did u clear the codes after replacing it?


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- David
88' GTA 5.7L TPI MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass, Gutted CAT, Flowmaster 80 Series

http://www.geocities.com/david_angel_16



[This message has been edited by breathment (edited November 05, 2001).]

 

Yea I cleared the codes everytime I drive it somewhere and they show up.Gonna check everything that you told me will postup what I find tomorrow.
Thanks,
BD3

 

Found the wire was shorting out against the EGR.Thanks
BD3