1998 yukon Mystery p0300 and rough idle still

[OilBurner2003]

Check the white wire on ICM back to ECM/PCM. Also wiggle wires on ICM and coil connectors when engine running. See here-

How To Test The GM Ignition Control Module (1995-2005)

GM 4.3L, 5.0L, 5.7L Index of Articles

easyautodiagnostics.com

I’ll take a peek!

 

[OilBurner2003]

I’ll take a peek!

Update: A whopping THREE weeks and I haven't heard anything from the mechanic! Not sure what's happening. Never waited this long for a diagnosis. I guess I did the right thing not to continue to fix it, I hope.

 

[exp500]

They should get a call or visit from you. I think it is time for a different shop.

 

[OilBurner2003]

They should get a call or visit from you. I think it is time for a different shop.

I’ve been heavily considering that. Ol boy has usually been extremely reliable but…Dude. I probably could have switched a new vortec in by the time he’s supposed to call me! I don’t think it could possibly be that complicated.

 

[OR VietVet]

What was the agreed upon time/contact when the rig was dropped off. If you have used them before and trust them, then yes, contact them and see what they have to say. Many things could have happened but still, a contact call with an explanation of the problem with no contact should have been done. My side business is getting busier and busier because I contact and stick to what I promise.

 

[OilBurner2003]

What was the agreed upon time/contact when the rig was dropped off. If you have used them before and trust them, then yes, contact them and see what they have to say. Many things could have happened but still, a contact call with an explanation of the problem with no contact should have been done. My side business is getting busier and busier because I contact and stick to what I promise.

Told him to take his time, didn’t wanna rush him for a answer. Figured that within two weeks he’d get back, even with a big job he gave a call within a week. I’d imagine it’s just a really busy month since I never gave him a exact time I wanted it back, which is probably my fault. I’ll give him a call some point and find out the status on it.

 

[OilBurner2003]

What was the agreed upon time/contact when the rig was dropped off. If you have used them before and trust them, then yes, contact them and see what they have to say. Many things could have happened but still, a contact call with an explanation of the problem with no contact should have been done. My side business is getting busier and busier because I contact and stick to what I promise.

Just had a quick question. Mechanic called and said that one of the O2's wasn't sending enough data because of a exhaust leak, like it wasn't even changing at all, stuck at .450V while the rest are moving normally. I'm sure I know the answer, But can a exaust leak cause something like a p0300? He's not sure if he's found it yet, just looking for opinions.

 

[exp500]

A P0300 could cause an exhaust leak, kinda doubtful the other way around. If it is a downstream sensor could be clogged cat. That would cause a misfire. Need more info. Could you hear the exhaust leak Before?

 

[OilBurner2003]

A P0300 could cause an exhaust leak, kinda doubtful the other way around. If it is a downstream sensor could be clogged cat. That would cause a misfire. Need more info. Could you hear the exhaust leak Before?

I can't hear it, Mechanic says I have a big one somehow. Replaced the whole exhaust myself and sprayed with soapy water afterwards, couldn't find anything. B1S2 has no reading, stuck at .450V. Maybe I messed up at the flange and it's leaking there, would be news to me. It had a p0140 even before I changed the exhaust, wonder if it's either the leak or a burned/Shorted wire. Looks like it's a upstream sensor before the cat. Or maybe not...I had this all memorized a couple months ago. Other sources tell me it after the cat, which again, is brand new.

 

[exp500]

Are O2 sensors new? Denso's work good on these and are cheaper.
Did they fix the burned wiring? Still chasing P1351?