University Auto Repair Flagstaff - recommend

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University Auto Repair in Flagstaff diagnosed and resolved a mysterious cold rough idle and stumble that disappeared once the engine warmed.

Flagstaff's Toyota dealership thrice tried and failed, and then gave up. A few other shops wouldn't even touch this vintage (94 1FZ-FE). The truck's service history suggests that previous owners had chased the problem with other shops for years.

I asked the guys at University Auto Repair to take whatever time they need to figure it out. They worked through a methodical diagnosis and figured it out, and for a reasonable price.
 
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Three interacting problems; faulty splice on cylinder 6 injector wiring; faulty wire connections on cylinder 4 and 5 injectors; clogged egr line. Because the problem resolved once the engine warmed, I was worried it was head gasket or cracked head (resealing once the metal expanded), unmetered air, or a leak into the exhaust upstream of the O2 sensors causing a too-rich mixture that'd lean out upon warming. I was, as usual, wrong, as were many others.
 
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Three interacting problems; faulty splice on cylinder 6 injector wiring; faulty wire connections on cylinder 4 and 5 injectors; clogged egr line. Because the problem resolved once the engine warmed, I was worried it was head gasket or cracked head (resealing once the metal expanded), unmetered air, or a leak into the exhaust upstream of the O2 sensors causing a too-rich mixture that'd lean out upon warming. I was, as usual, wrong, as were many others.

Thats a pretty common problem on the 93-94's. Did they wrap the wiring harness with insulating tape near the EGR tube after the repair? If not, I have some left over wrap from when I did mine.
 
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Thats a pretty common problem on the 93-94's. Did they wrap the wiring harness with insulating tape near the EGR tube after the repair? If not, I have some left over wrap from when I did mine.

I remember having some idle issues that I was able to solve by replacing my EGR stuff but haven't heard of the electrical stuff potentially causing problems... I'm gonna have to look into that for some preventative maintenance.
 
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wiring harness by the EGR tube can be pulled away from it with a zip tie - Kevin (Tools R Us) did this on EVERY single 80 that came by the shop, for free - while he was casually chatting with the owner :lol:

Yep. I checked and University both insulated and zip-tied the wiring away from the EGR tube. So, more high marks. Hopefully that ends my learning experience with this particular quirk of the 94s.
 
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it's not just the '94s, all 80 series have that "wiring-harness-too-close-to-the-EGR-tube" problem
The 95+ are 2-3” further away from the egr pipe than the 93/94. No reason not to wrap them on the later model, but they have plenty of clearance compared to the 93/94.
 

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