Hey guys, i have a service engine light intermittently on.

I havnt had a chance to take it to murrays and get the codes checked, but i think i have an idea of what caused it.


I swapped my intake gasket last weekend and some of the vacuum line was really brittle... we broke one that goes between the EGR and the intake manifold at the drivers side where theres 3 lines coming to 1 port. We replaced the broken section with a soft vacuum line. Is it possible that when the EGR opens or closes it is pinching the line or otherwise somehow causing the SES to come on because of that line?

 

There shouldn't be three lines attached to the intake manifold nipple for the EGR vacuum. Photo of 95 EGR components, courtesy of Shoebox:

http://shbox.com/1/egr1.jpg

Its possible you are getting DTC 32 for lack of EGR flow.... but that's not necessarily a logical conclusion. If the EGR vacuum line was previously broken, that's when you would have got the code. Fixing the line shouldn't cause the light to go on, unless you screwed it up somehow. Not sure why the EGR valve operating would be "pinching the line". If its the piece of line from the manifold nipple to the EGR solenoid, its always got a vacuum on it, whether the EGR valve is operating or not. If the soft line is so thin its collapsing under the vacuum, you would see it as soon as you started the engine.

As far as getting it scanned at a parts store, make sure they understand the 95 has an OBD-I PCM, with a 16-pin OBD-II connector, and they can not read it with an OBD-II scanner, and require an adapter plug or jumper wires to read it with an OBD-I scanner. Again, courtesy of Shoebox:

http://shbox.com/1/xraycable.jpg

 

You are the man. That schematic is awesome. Okay... my car is wierd. Where that line connects to the intake is a few elbows and splitters so a buncha stuff is connected there. I see where we made the mistake with the EGR line though. When we broke it my buddy reconnected it and he ran it to the elbow off of the manifold, not to the little electronic box like is pictured. I'll try that when I get home and hopefully i'll have a properly running camaro so I can go smoke my buddies GT since he's home from the marines.

 

Be nice to Marines..... even if they do own 'stangs.

 

Hah always. We took him out last night and got him pretty smashed.... He had a good time... so tonight it is time to have a little fun.