car keeps running

[stangGT87]

So i turn my car off and it just keeps running for a few seconds and i dont know y it just started a few days ago. Also when accelerate in gear it kinda studdars a pops a little bit a little bit between like 1500- 4000. and it feels like there is no power but it only does this when its in gear. not when i just rev it up. Please help.

 

[stangGT87]

mods
87 mass air Stang with GT 40 uper and lowers, Long tubes into Bassani X pipe, MSD 6AL, Blaster coil, e 303 cam, 1.60:1 roller rocker arms, Eletric fan, 140 amp alternator upgrade, AC delete.

 

[HISSIN50]

I would start with a thorough code yanking.

Continuing to run can be a couple things but perhaps codes can shed some light..........

Good luck.

 

[89Notch]

It's not pre-igniting is it? Where there is carbon buildup that stays hot and ignites the fuel with no spark... that would be bad.

 

[stangGT87]

i dotn know how to check if it is pre igniting... and i went to auto zone to get my codes checked and after the guy hooked up the reader it started smoking... then he tried a new reader and it smoked as well...

 

[dastang2]

out of time, carbon buildup,running hot, i think egr problems can do this too. it's called dieseling

 

[HISSIN50]

Dieseling was much more common on carb'd stuff. I dont think I've ever seen an EFI car diesel.

 

[dastang2]

it's the same thing regardless of fuel system.

 

[Roland69]

i dotn know how to check if it is pre igniting... and i went to auto zone to get my codes checked and after the guy hooked up the reader it started smoking... then he tried a new reader and it smoked as well...

That can't be good that could be a whole dirrerent problem on it's own.

 

[HISSIN50]

I'll beg to differ. Without fuel (injectors are off), it's hard for dieseling to occur. The different methods of fuel introduction (carbed vs injectors) is what makes the difference. That's one cool thing about electronically controlled fuel metering.

Some carbs would only flow fuel if the idle solenoid received 12 volts, and this device was to help with dieseling.

 

[86bluecobra]

perhaps the injectors are not stoping. you said it was only for a few seconds so it could still be dieseling or running on with what little fuel was left at the injectors stopped pulsing. i see your point though hissin.

 

[stangGT87]

But what explains the poping when i accelerate in gear and the sluggish acceleration it just seems to not have any power? and i can rev it up just fine in neutral

 

[dastang2]

But what explains the poping when i accelerate in gear and the sluggish acceleration it just seems to not have any power? and i can rev it up just fine in neutral

mentioned above, out of time, egr problem,running hot,fuel pump,clogged cats could be making things really hot in there.