2nd Generation Specific 1986-1992 Discussion

Boost or Fuel problem?

Old 10-15-2006, 07:56 PM
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Join Date: Mar 2004
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OK here is the deal after much searching in the site I can not fond a satisfactory answer. So here's the deal:

Under 3400rpm I can hit 10psi all day long. Good fuel mixture and everything. However once I hit around 3400rpm fuel mixture leans out and boost shoots down.

From what I understand that the secondaries come on about that time while under boost. Is there anything else going on electronically or mechanically that would cause this issue? Sometimes the problem goes away for a little while just to let me have a little fun but then it returns just in time to spoil everything.

This is NOT 3400rpm hesitation. Car has less than 15k on the fuel injectors and the clips, and SAFC. Any and all help is greatly appreciated.
warpspeed2000 is offline  
Old 10-16-2006, 09:45 AM
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what year is the car? the 89+ cars seem to need the fuel pressure solenoid hooked up to turn the secondaries on
j9fd3s is offline  
Old 10-18-2006, 11:19 PM
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It could be your secondary injector driver in the ecu. I think if you unhook the map sensor from the intake, the secondary injectors should come on at 3800 as you rev the car. Try swapping ecu's with some one. I also experience something similiar and it was a bad afm,
woundup7 is offline  
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