Car running rough and Stalling

[LGAFF]

Thoughts on the data below I am thinking a map or TPS issue? Idles ok and then falls apart and almost stalls when you accelerate 1285712858


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[-=Jeff=-]

Hmm, bad MAP should throw a code.. TPS with key on engine not running you should be able to exercise the TPS and see the voltage.

How old is the gas?

[XfireZ51]

I commented on FB that the MAT sensor reading was low unless it was relocated.

[LGAFF]

-New Gas
-New fuel Pumps
-New Filter
-Pumps and pressure test good
-Spark seems strong it will arc when pulled
-idle is fine
-Once under load it almost dies
-when you let off and give it a second it recovers and you can drive slowly

[dredgeguy]

Sounds like my problem a few days after I installed new fuel pumps. One of the hose clamps came loose and under load would pull away from the assembly and starve the engine of fuel. Replaced with stainless clamps and problem solved.

[LGAFF]

Im not seeing drops in Fuel Pressure but will put this on my list, thanks

[XfireZ51]

-New Gas
-New fuel Pumps
-New Filter
-Pumps and pressure test good
-Spark seems strong it will arc when pulled
-idle is fine
-Once under load it almost dies
-when you let off and give it a second it recovers and you can drive slowly

Have u checked injectors?

[LGAFF]

Checked for leaks yes none 2 year old Accel brand


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[LGAFF]

12866


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[LGAFF]

-New MAP sensor and hardline hose; little to no change

-Seems like its maybe not getting enough fuel or timing

[LGAFF]

Well it runs great in low power mode.... I might need to check my tune.

[LGAFF]

Found chip paperwork secondary port controls removed... so this is odd, but narrowing down the problem hopefully

[LGAFF]

Well this turned out to be injectors; they were only a few years old but prior to this I had an issue with bad/old fuel ... might have done them in ..... I replaced yesterday and car ran perfect...

[XfireZ51]

Well this turned out to be injectors; they were only a few years old but prior to this I had an issue with bad/old fuel ... might have done them in ..... I replaced yesterday and car ran perfect...

Was it all of them, a few, one? How did u determine?

[LGAFF]

I knew it was some sort of fueling issue;(Mr Haibeck helped me rule out some sort of ECM issue) I tested secondary relays(good), fuel pressure was always good so tried the Fuel Injectors and problem is gone. It was the secondaries only(had a different batch # on it) very odd... they ohmd fine and didnt leak

[XfireZ51]

I knew it was some sort of fueling issue;(Mr Haibeck helped me rule out some sort of ECM issue) I tested secondary relays(good), fuel pressure was always good so tried the Fuel Injectors and problem is gone. It was the secondaries only(had a different batch # on it) very odd... they ohmd fine and didnt leak

Lee,

Had a similar issue w injectors recently. 2 bad secondary injectors altho they did ohm ~ 45ohms. Had bad coils as well.