Intermittent Boost and stalling at idle


H

Hydra GT

GT Owner
Mark II Lifetime
Oct 18, 2008
137
Delray Beach, FL
Had a chance to attend the wonderful Miami Mile this past weekend with some awesome GT owners. My car ran nicely, but it seemed to shut off at idle a bunch. While getting ready to start the mile runs, the car would die and then have to be started 3 or 4 times. I have read some old threads about the fuel neck issue. Maybe the culprit. I do have a brand new one as one of my spare parts.

Furthermore, on the start of one run (in car camera showed) while in first gear, there was NO boost and a quick shift to second gear brought the boost to full on. Every gear worked fine with full boost after that.

But on the next run, everything worked perfectly, until i shifted into 5th gear. Then the dreaded NO Boost happened and the car bogged down.

I ran one more time and shifted around 6K rpms and everything worked ok....Ran one last time and shifted at 6500 and NO BOOST when hitting 5th gear.

I ran the SCT tuner and found Trouble code P1000. I did disconnect the battery, but did drive the car about 200 miles. I did change the tune once i got to the track, however.

My car has a pulley and tune, K&N filters, air intake stiffener, Accufab throttle body and Heffner X-pipe.

Any help, suggestions, tests to run, etc. would be really appreciated! :thumbsup:thumbsup
 
Hi Hydra GT,
I think the code 1000 you have is just saying the computer has recently been cleared and the car has not heat cycled enough times to be legal for a smog test. They put that one in there to keep people from clearing codes just before smog inspection.
 
The same think happen to me during 2 runs at Hennessey's track and it also happened to another FGT owner during the Mojave Mile. For some reason the ECU is activating the supercharger's bypass valve when everything with the engine seem to be OK.
 
BlackICE said:
The same think happen to me during 2 runs at Hennessey's track and it also happened to another FGT owner during the Mojave Mile. For some reason the ECU is activating the supercharger's bypass valve when everything with the engine seem to be OK.
Click to expand...

I think it happened to Camilo on his last attempt of the day in Miami also.
 
Is this possibly related to the "Tune"? Mass air sensor? something telling me that i need a twin turbo set up? :)
 
Hydra GT said:
Is this possibly related to the "Tune"? Mass air sensor? something telling me that i need a twin turbo set up? :)
Click to expand...

Something tells me that all these mile events are going to drastically increase the number of TT GT's. :lol :cheers
 
Any other suggestions?
 
Check that the bypass valve arm is not binding.
 
I seem to recall that "FUBAR" on here had some similar issues -I believe he ended up replacing either a solenid or the by-pass valve itself - I may be mistaken - but look up some of his posts?

edited to add: Look at this thread - from about page 15/16 onwards - a few issues with the bypass and the actuator - probably what is happenng with yours? :

http://www.fordgtforum.com/forums/showthread.php?t=15866&page=17
 
Last edited:
Thanks dealmaker! I am going to replace the actuator this week. Torrie sent me the part. Hope this helps.
 
Hydra GT said:
Any other suggestions?
Click to expand...

TT it.

:biggrin
 
Hmm...Jason is only a few hours away :)
 
Apollo said:
Hi Hydra GT,
I think the code 1000 you have is just saying the computer has recently been cleared and the car has not heat cycled enough times to be legal for a smog test. They put that one in there to keep people from clearing codes just before smog inspection.
Click to expand...

P1000 = OBDII readiness codes have not been set.

This could be as shared or because certain OBDII functions have been turned off

Takes care

Shadowman
 
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