gahhh mental random problems

[suprra_girl]

specs:
7mgte, 46 trim ct26, stock fuel system, 2 1/2 exhaust, intake

started off with code 11 (random stalling)
moved some grounds and added a ground from the battery to chassis (was missing
code 11 fixed

fuel pump problem (more stalling)
then got intermittent power supply to fuel pump... sometimes it has power sometimes it don't
jumped ign feed to fuel pump wire
i believe fuel pump supply now fixed

new problem
driving fine, stop at lights or crossing etc
go to accelerate and car just stalls (doesn't happen every time... probly once every trip)

have the car idling in the driveway... rev it a bit and hold it... it pops/backfires (i'm guessing it's running quite rich at idle, thinking of sticking in slightly colder plug to help with burning)
rev it quite a bit up to 4.5k and off and back up etc etc
leave it come back to idle... sitting there for about 30-60 seconds... then just out of the blue revs start slowing down to 400rpm and then STALL

no codes
when running it runs mint!

just randomly stalls :s

any ideas to throw around?

Thanks

 

[IJ.]

Filthy/blocked ICS?

 

[suprra_girl]

i was just suddenly thinking

it's kinda odd.... the stalling thing... how it stalls i'm sure the ecu would normally throw a code

sooooooooo... what i'm thinking..
the ecu is intermittently losing power... hence shutting down the engine and no storage of codes

hows that theory?

 

[GrimJack]

^^^ what he said. Also check the dashpot setting, and check the TPS just on general principles.

 

[GrimJack]

I'm pretty certain that the ECU stores enough power to set a code 11 if it loses power. Should be easy to check though, fire it up, pull the EFI fuse while it's running, then plug it back in and check for codes.

Of course, the usual disclaimer applies - I have NO clue what sort of carnage this might cause.

 

[suprra_girl]

hmm... but imagine driving.... and (hypothetical of course lol) someone removes the power terminal off the battery.... is it going to store codes?

and what on earth is a dashpot setting?

and just something funny.... not once in new zealand have we had a tps go out lol
don't ask me why or how
but i'll check it anywayz

 

[GrimJack]

Here you go, Suze:

http://www.cygnusx1.net/supra/library/TSRM/ec/EC_08.html

 

[suprra_girl]

checked dashpot
all works cept when it says to pinch pipe and idle should go to 2000rpm, ours goes to 1000rpm

what would that indicate?
just runnin a bit rich i would assume hehe

 

[IJ.]

hmm... but imagine driving.... and (hypothetical of course lol) someone removes the power terminal off the battery.... is it going to store codes?

and what on earth is a dashpot setting?

and just something funny.... not once in new zealand have we had a tps go out lol
don't ask me why or how
but i'll check it anywayz

If you're driving (motor running) the Alternator is suppling the power so you can unhook the battery leads and it will keep running Suze.

 

[suprra_girl]

well that was rude!!

ruin my theory

LOL j/k

so........ what will this dashpot do by being out 1000rpm?

any other ideas?

 

[GrimJack]

Unfortunately my knowledge of the dashpot ends with the fact that it messes with your throttle plate, and therefore could do odd things to your engine.

 

[Allan_MA70]

check all ecu related connections for corrosion, check battery voltage as you drive, check amps as you drive, check voltage at ecu while you drive etc etc..