Boost Trouble

devsdad01 · 10-02-2011, 05:00 AM

I recently replaced the head gasket on my 1990 Turbo Coupe and took it out for a test spin today. It runs and idles smooth, but when the turbo spools up towards 4 psi it feels as though it looses massive amounts of power and it pulses very rapidly almost like it is missing. I set the time so I know that couldn't be a factor. The car ran fine before the head gasket blew and was boosting a solid 8 to 10 psi. Any ideas on what I may need to check or what could possibly be causing this problem?

Any information would be greatly appreciated as I am stumped!

trd_brad · 10-02-2011, 05:06 PM

knock sensors? are they pluged in?/broke?

afm wireing?

buddy of myn has the same problem

do a code chech should tell you

if its your knock sensors then it would cause the issue your explaining as they change the timing
hope this helps

El Supracabras · 10-03-2011, 01:34 PM

Missing under boost? After you've checked for codes, check your coil ground and double check intercooler piping, clamps and hoses.

87hilux7mge · 10-03-2011, 03:46 PM

Quote:

Originally Posted by El Supracabras

Missing under boost? After you've checked for codes, check your coil ground and double check intercooler piping, clamps and hoses.

+1. i concure doctor

10-02-2011, 05:00 AM	#1
devsdad01 Stock Join Date: Jul 2010 Location: Il, USA Posts: 6	Boost Trouble I recently replaced the head gasket on my 1990 Turbo Coupe and took it out for a test spin today. It runs and idles smooth, but when the turbo spools up towards 4 psi it feels as though it looses massive amounts of power and it pulses very rapidly almost like it is missing. I set the time so I know that couldn't be a factor. The car ran fine before the head gasket blew and was boosting a solid 8 to 10 psi. Any ideas on what I may need to check or what could possibly be causing this problem? Any information would be greatly appreciated as I am stumped!

10-02-2011, 05:06 PM	#2
trd_brad Intake Join Date: Sep 2011 Location: kelowna B.C Posts: 39	knock sensors? are they pluged in?/broke? afm wireing? buddy of myn has the same problem do a code chech should tell you if its your knock sensors then it would cause the issue your explaining as they change the timing hope this helps __________________ red 89 targa tuuuurrrrboo bone stock.......for now anyone ever notice that inspector gadgit drives a supra?

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10-03-2011, 01:34 PM	#3
El Supracabras 3" Exhaust Join Date: Feb 2010 Location: Chicago Posts: 240	Missing under boost? After you've checked for codes, check your coil ground and double check intercooler piping, clamps and hoses.