24x hell
Got it tuned, it ran OK, but was plauged with issues from the start, like we couldn't get the TPS to zero out. It ran like garbage when cold.
Then when I drove it PA this summer is when it started running like garbage all the time.
Then when I drove it PA this summer is when it started running like garbage all the time.
Just trying to get the whole picture here.
A misfiring cylinder pumping air into the exhaust will cause a false lean condition for that bank and PCM will try to compensate adding more fuel on the same side.
Make sure all your coils and plugs are firing
Thread Starter
Joined: May 2006
Posts: 3,974
Likes: 2
From: Spring Hill, FL
Is there a way to read out the coils? I could read the wires out, I suppose I should have done that yesterday when I did plugs.
Well its never ran right under 20% throttle, just that in the last two months it been worse.
Well its never ran right under 20% throttle, just that in the last two months it been worse.
Thread Starter
Joined: May 2006
Posts: 3,974
Likes: 2
From: Spring Hill, FL
Great! Now what the hell is wrong with this thing? I went out, turned fuel trims off as recommended, loaded the tune. No errors. Go to start the car, it cranks maybe a second then nothing, turn the key again still nothing??? WTF?! So now it won't run at all?
Thread Starter
Joined: May 2006
Posts: 3,974
Likes: 2
From: Spring Hill, FL
More info: ses light is slowly flashing, fuel pump is not shutting off after initial prime. Car doesn't even attempt to start, battery is good but it reminds me of when you have a dead battery, you turn the key to crank and nothing happens.
How the hell did I go from a car that ran like *** to not running at all? This isn't good, I have class tomorrow!
How the hell did I go from a car that ran like *** to not running at all? This isn't good, I have class tomorrow!
Thread Starter
Joined: May 2006
Posts: 3,974
Likes: 2
From: Spring Hill, FL
The injectors should be good, they only have two weeks of run time on them, brand new injectors I put in before I made this thread. Hell it is what prompted me to make this thread.
I had removed ones I thought troubleshooting had shown to be bad.
Battery is a optima red top, multimeter shows 12.42 volts. Checked the fuses, no burned out fuses.
Starter is a Duralast, I swapped it out Friday. I suppose it could be dead, but damn what are the odds? I suppose I will have to pull it and get it tested to rule it out. I swapped it out Friday as the body split!
I had removed ones I thought troubleshooting had shown to be bad.Battery is a optima red top, multimeter shows 12.42 volts. Checked the fuses, no burned out fuses.
Starter is a Duralast, I swapped it out Friday. I suppose it could be dead, but damn what are the odds? I suppose I will have to pull it and get it tested to rule it out. I swapped it out Friday as the body split!
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Verdad Gallardo Thread Starter
Joined: May 2006
Posts: 3,974
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From: Spring Hill, FL
Won't crank at all. When I turn the key its like the starter thinks about working and then poof! Nothing. About to pull the 5 day old starter, both it and the redtop will be making a trip to Autozone.
Can a battery show volts but then when asked to provide the juice just fall on its face?
If its neither of these I don't know where to go next.
I don't understand how a car could run, but not good, then I reload the previous tune and then the car won't crank? PCM test says the PCM is fine also.
Can a battery show volts but then when asked to provide the juice just fall on its face?
If its neither of these I don't know where to go next.
I don't understand how a car could run, but not good, then I reload the previous tune and then the car won't crank? PCM test says the PCM is fine also.
TECH Fanatic
Joined: Feb 2006
Posts: 1,025
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From: CT/NJ
Won't crank at all. When I turn the key its like the starter thinks about working and then poof! Nothing. About to pull the 5 day old starter, both it and the redtop will be making a trip to Autozone.
Can a battery show volts but then when asked to provide the juice just fall on its face?
If its neither of these I don't know where to go next.
I don't understand how a car could run, but not good, then I reload the previous tune and then the car won't crank? PCM test says the PCM is fine also.
Can a battery show volts but then when asked to provide the juice just fall on its face?
If its neither of these I don't know where to go next.
I don't understand how a car could run, but not good, then I reload the previous tune and then the car won't crank? PCM test says the PCM is fine also.
The fuel pump not shutting off would lead me towards a PCM problem. Maybe it went bonkers and opened all the injectors and left the pump on = hydrolocked on gas.
Won't crank at all. When I turn the key its like the starter thinks about working and then poof! Nothing. About to pull the 5 day old starter, both it and the redtop will be making a trip to Autozone.
Can a battery show volts but then when asked to provide the juice just fall on its face?
If its neither of these I don't know where to go next.
I don't understand how a car could run, but not good, then I reload the previous tune and then the car won't crank? PCM test says the PCM is fine also.
Can a battery show volts but then when asked to provide the juice just fall on its face?
If its neither of these I don't know where to go next.
I don't understand how a car could run, but not good, then I reload the previous tune and then the car won't crank? PCM test says the PCM is fine also.
Thread Starter
Joined: May 2006
Posts: 3,974
Likes: 2
From: Spring Hill, FL
Starter and battery both tested good, have a PCM on order.
Now the big question, could some things have been bad in this PCM from the get go? This thing has never been right since November, just go through phases of running decent and phases of running like garbage.
Now the big question, could some things have been bad in this PCM from the get go? This thing has never been right since November, just go through phases of running decent and phases of running like garbage.
Teching In
Joined: Sep 2010
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Thread Starter
Joined: May 2006
Posts: 3,974
Likes: 2
From: Spring Hill, FL
Latest update, pull plugs, rotate motor by hand, get fuel out. Insert dry spark plugs. Different PCM........
Same results! Cranked about two seconds then stopped, full of fuel already. What the hell has happened that this car is just dumping ungodly amounts of fuel at all the cylinders?!
Same results! Cranked about two seconds then stopped, full of fuel already. What the hell has happened that this car is just dumping ungodly amounts of fuel at all the cylinders?!
Get a TTS log on it and look for "injector fault" on the right hand side of the program. If it is lit as a "1" you might have a harness problem. The injectors fire by grounding them. If you have the injector wiring grounded in the harness somewhere as soon as you turn your key on, your injector(s) will open full tilt.
Thread Starter
Joined: May 2006
Posts: 3,974
Likes: 2
From: Spring Hill, FL
Aren't all 8 injectors wired separately though or no?
I just don't understand how I drove the car to class Tuesday and back home. Then Wed. I load a tune, car starts but runs bad, didn't want to hold an idle. Shut down reload last tune that at least got me around. Cranks for about two seconds then the fuel hydrolock issue.
Can you clarify TTS log? Is that some feature in EFI Live?
All fuses check ok.
I just don't understand how I drove the car to class Tuesday and back home. Then Wed. I load a tune, car starts but runs bad, didn't want to hold an idle. Shut down reload last tune that at least got me around. Cranks for about two seconds then the fuel hydrolock issue.
Can you clarify TTS log? Is that some feature in EFI Live?
All fuses check ok.
The fuel injectors should have one fuse per bank. They get full battery positive from the fuses. The battery negative (ground) is switched in the PCM. This gives the PCM the ability to monitor the injector's status.
As this is a wiring harness from EFI, the 4/7 "correction" should've been done in the wiring.
Your issues started when you changed the tune. You've also swapped the PCM.
>What tune is in this newly swapped in PCM?<
As the EFI harness & system makes the PCM "think" it's running a LS1, I suggest you swap in a stock LS1 PCM from a running car-without changing the tune, then see how things run.
For heavens sake, CHECK THAT OIL! All that fuel can and will wash down past the rings and fill the crankcase. You'll know when this has happened because your oil pressure will go way down as fuel can't be readily pumped by an oil pump.
As this is a wiring harness from EFI, the 4/7 "correction" should've been done in the wiring.
Your issues started when you changed the tune. You've also swapped the PCM.
>What tune is in this newly swapped in PCM?<
As the EFI harness & system makes the PCM "think" it's running a LS1, I suggest you swap in a stock LS1 PCM from a running car-without changing the tune, then see how things run.
For heavens sake, CHECK THAT OIL! All that fuel can and will wash down past the rings and fill the crankcase. You'll know when this has happened because your oil pressure will go way down as fuel can't be readily pumped by an oil pump.
Last edited by Paul Bell; Sep 23, 2011 at 09:15 PM.
how sure are you that the tune loaded successfully? Any chance it didn't? worth loading a different file to check too. On EFI connection site, he has some sample files. That's what speedinc used as a base to get my tune done (so they told me anyway)