This is topic Fox Check Engine light??? in forum Tech Talk at Northern California Ford Owners  .


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Posted by 89SIDWAZGT (Member # 1502) on :
 
Anyone know the best way to find out why the check engine light is on? I have a 89 GT with a E 303 cam, Edelbrock TB, and some basic bolt ons.
If anyone can help let me know, I'm trying to get it ready to sell! Thanks.
 
Posted by 91sleeper (Member # 779) on :
 
Scann the codes.
 
Posted by Quick 88LX (Member # 1950) on :
 
It has to due with your smog equipment or vacuum lines. Trust me, I had the same problem when I was about to sell my 93GT. I had a smog hose that somehow broke off a hose clamp and the vacuum pressure was ALL fucked up. I fixed that shit and the light went away. Make sure everything is connected properly and tight!
 
Posted by white1990stang (Member # 2307) on :
 
check all your plugs especially your egr plug.
 
Posted by Black94 5.0 (Member # 655) on :
 
One way to do it is replace every single part, one by one, until your check engine light goes off..(LMFAO! [Big Grin] )....

Get a quality code scanner (like Snap-On) and find out exactly what the problem is right away....If you cant get a code scanner then it will still be cheaper to pay a good shop 1/2 an hour labor to find out the codes..
 
Posted by punkrawkdude99 (Member # 2427) on :
 
check engine light is almost always emissions related...i would start with the obvious and simple....make sure your o2 sensors are plugged in and not destroyed....i would have smog pump tested and see if it works....it could be the computer not letting the smog pump valve open....that's a computer malfunction...i've seen that happen in a lot of 91-93 stangs with maf and those newer computers....
 
Posted by street_illegal_stang (Member # 1554) on :
 
if it matters my check engine light came on a few months ago...turns out the orange wire that was bolted to the back of the driver side head..i think it grounded either the fuel pressure regultor or the fuel injectors? i reconnected it to the wire harness right above the pcv valve..no more check engine light. [Razz]
 
Posted by rokcrln (Member # 2536) on :
 
My neighbor just scanned mY 91 GT tonight for an engine light comming on at acceleration and then going off. The scan showed the pip is not working right and the neutral safity is not grounded right and also my pcv is faulity. Took him 5 min to do this so once it is fixed he will check and clear all codes then add about 15hp to the comp. I love having gear heads for neighbors.
 
Posted by shade-tree (Member # 298) on :
 
you can use a digital voltmeter to scan for codes (check your chiltons), or the $25 'code scanner' for Ford's they sell in the parts stores.
 
Posted by st5150 (Member # 51) on :
 
www.corral.net/eec has good info.
 




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