Weird Idle and Turbo issue

jherguth · 09-12-2020, 02:02 PM

‘83 GLT Turbo. Cold start, starts right up, no problem. Once is starts to warm and hits that second stage it will stall if I don’t keep giving it gas. Once it’s warmish, if I start to drive, it will lag and feel almost like it’s not getting fuel. Weird. Where do I even start? I replaced the IAC valve when it had a ridiculously high idle and it was good for maybe 6 months.

Also, different issue altogether, my turbo will not get over 50% boost no matter how hard I push it. What could that be?

espbassist88 · 09-15-2020, 08:25 PM

I'm not too sure about the idle issue, as I am chasing my own idle issue too on my 86' 740 Turbo. The boost issue sounds like a leak issue somewhere within the intake/intercooler route, or maybe a wastegate issue.

Mr. V · 09-15-2020, 11:20 PM

A high idle could be from a bad coolant temp sensor or its wiring.

jherguth · 09-17-2020, 11:04 AM

Fuel pump is shot. Its been wheezing for quite a while now so assuming the in-tank pump failed awhile ago.

09-12-2020, 02:02 PM	#1
jherguth Board Member Join Date: Apr 2016 Location: Highlands, NJ	Weird Idle and Turbo issue ‘83 GLT Turbo. Cold start, starts right up, no problem. Once is starts to warm and hits that second stage it will stall if I don’t keep giving it gas. Once it’s warmish, if I start to drive, it will lag and feel almost like it’s not getting fuel. Weird. Where do I even start? I replaced the IAC valve when it had a ridiculously high idle and it was good for maybe 6 months. Also, different issue altogether, my turbo will not get over 50% boost no matter how hard I push it. What could that be?

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09-15-2020, 08:25 PM	#2
espbassist88 Board Member Join Date: Mar 2016 Location: Gaston, SC	I'm not too sure about the idle issue, as I am chasing my own idle issue too on my 86' 740 Turbo. The boost issue sounds like a leak issue somewhere within the intake/intercooler route, or maybe a wastegate issue.

09-15-2020, 11:20 PM	#3
Mr. V Board Member Join Date: Jul 2004 Location: Portland, Oregon metro	A high idle could be from a bad coolant temp sensor or its wiring.

09-17-2020, 11:04 AM	#4
jherguth Board Member Join Date: Apr 2016 Location: Highlands, NJ	Fuel pump is shot. Its been wheezing for quite a while now so assuming the in-tank pump failed awhile ago.