So since i ve installed my LT4 motor 3 years ago i came accross a lot of small problem but with the help of a lot of member i ve manage to clear them up except for this bad one.I miss some time to work on it last year but last week i finnally installed my ltcc(working great) and its now the time to clear the last problem.

So when im at a red light or a stop and i wanna go, the car hesitate,burp,shake,advance slowly and suddenly the power came back.Same thing when im crusing(no matter what gear im using).Ex: im at 60mph and around 2000rpm no too much throttle,the car hesitate,burp,shake.If i give it some throttle or slam it,it will still hesitate shake but suddenly the power come back and the car pull really hard even at 12.3 afr to 6500rpm(rev limiter).

The car start perfectly.

So i ve change:
-5 opti(2 no name for test,1 gm ,2 msd)
-opti harness
-couple set of plugs
-couple sets of wire
-Delteg
-LTCC (will stay on the car)
-maf harness
-maf
-o2 sensors
and a lot more

So any idea on what should i look at ,test.

Thanks

Eric

 

You have put so much time and money into this and still no datalogging? This is where I would go next.

 

Yep, this is probably why it is not already fixed.

 

Same issue your having I had, chased it for a year the previouis owner chased it for three. I spent alot of time and money trying to fix it, last week I removed the LTCC got a new Opti converted it back to stock and it works fine now no issues.

 

Have you looked for something as basic as a torn inlet elbow?

 

Check your vacuum and fuel pressure.

 

95Blackhawk and Shoebox:
-Since i never had any check engine i didnt think about logging it but i will.

Venomous360:
I ve tried every method(stock,delteq and ltcc) and it doesnt change a thing

Injuneer:
I got a trick flow elbow

raroz28:
How would i check vaccum?Fuel pressure is ok but i could check it back

Thanks to all.

 

Today i changed my fuel filter and also check my fuel pressure.Everything is fine.

I also made a log when im going from a red light and its bucking like hell.The log is not looking good at all.I can send it to anyone how would like to see it.

And it also give me two dtc code error:

MALF 42: EST Grounded

MALF 51: EPROM/Flash Checksum Fail

DTC 42, which can be caused by:
-faulty connection on the white wire from the PCM to the ICM
-grounded IC circuit between PCM and ICM
-faulty ICM
-faulty circuit on various connections to the ICM
-faulty PCM

I got a ltcc so no more icm and the white wire is connected to the ltcc box

So what does this mean

Thanks

 

I ve bought another pcm and wait for it but what about the rest??

 

i had 42 and 51 and changed my ignition system and everything is great now. dtc51 i hear is a fatal error but it could possibly be caused by a bad ground somewhere. Check all of your grounds. Is there anyway you could switch back to the factory setup and see if it still does it? also, any burnt wires anywhere??

 

I switch to ltcc 2 weeks ago i think before that i was running(or trying to) the stock ignition for over 2 years...

And dont wanna sound stupid but where are the ground point(cant remember correclty):

-There is one on the driver side between the driver head and chassis

 

Hmm took a chance this morning and reflash my pcm with ION tune.

The code are cleared even after i start the car wich i dont understand.

But now the car is running so rich on idle (113 and 93 ).I didnt even try to take it on the road....And my god it smell gas in the exauhst.

 

Might be a stupid question, but is the TPS working correctly?

 

There is no stupid questions,you try to help and thats nice

My tps seems to work correctly from the 3 logs that i got.My IAC is also working flawlessly(between 24 to 31 at idle) wich is perfect.

Yep i got now 3 logs:
-idle
-normal drive 1st to 4th gear
-4th gear wot

So if anyone wanna look at them i ll be please to email them.

 

What values are 113 and 93? The BLM's can't go below 108, so they must be for something else.

If your data logs are in excel or .csv format, send them to me. My Datamaster is on my "work" PC and I don't plan to spend a lot of time at the office in the next few days.