Printable View
i have swapped a 4.8 into my 1988 corvette an i have done the following things to it
1. sheet metal intake because of hood clearance
2. stage 4 btr cam [email protected] INT:224 EXH 230, Valve lift .553 INT .553 EXH Lobe sep 109
3. I get it to start but dies after 3-5 secounds after running
4 . ive got the right fuel pressure 58lbs
5. i have tbss injectors 30lbs because thats what i had
6 . my vats are turned off
&. stand alone harness
i think that might be it
heres my tune
Did you write entire after you turned VATS off? Post a log.
It would benefit you to put in the correct injector data, just saying. Will need more base running airflow too.
Still running a MAF or going speed density?
[QUOTE=5FDP;773754]It would benefit you to put in the correct injector data, just saying. Will need more base running airflow too.
Still running a MAF or going speed density
im not sure what im doing sir. its all new to me
im not sure on how to post a log sir . im still trying to learn how to post on here but i think im getting the hang of itQuote:
Originally Posted by ns158sl
how do i post a log sir
ive tried adjusting them but cant seem to figure it out
what is speed densityQuote:
Originally Posted by 5FDP
If you disable the MAF, it will force it to SD mode. That forces the engine to run on the VE table instead of the MAF and VE.
You can unplug the MAF and force it to SD.
Have you had your injectors flowed?
i hvanet had them flowed sir .
Attachment 144459Quote:
Originally Posted by kevin87turbot
You need to either spend a couple of months reading on here, watching you tube, and maybe pick up some of Greg Bannish’s books or hire a tuner to get this going. It’s going to be very hard starting at the very beginning and explaining everything via a question/answer back and forth.
OK, lots going on here.
First, you need to know whether it's setting the P0103 code. A lot of GEN3 PCMs have a tough time setting the code right after a flash or battery reset. When they do this they start and stall just like a VATS problem.
Second thing, zeroing the MAF table makes this worse when the problem is present. Sometimes restoring the MAF table allows them to run long enough to set the code.
Third, without know what injectors are in it, it's impossible to know if the data is correct which then leads to not knowing if the rest of the math is incorrect.
Flash this file in and then when you attempt to start it, check your codes with your scanner. If P0103 isn't present it won't run. Sometimes you have to crank it multiple times for it to set, then it'll take off and run normal.
Attachment 144460
The injectors are out of a TBSS intake 6 LITER the part number is12580681 for the injectors
Quote:
Originally Posted by edcmat-l1
so i am getting the p0103 code and im also getting a p0342 code as well .
P0342 is a cam sensor code. I don't know that it would set that code, but you did match up the reluctor tooth count to the ecm?
Attachment 144476 i think this is it
If you are trying to post a log, it should have a hpl extension. And they are auto saved even if you didn't save them when closing a scan.Quote:
Originally Posted by Corvette Chris 39
mine is a 24 tooth but i dont know how to go bout checking the ecmQuote:
Originally Posted by gtstorey
ok ill go check that real quick . thank you for helpingQuote:
Originally Posted by gtstorey
Attachment 144478Quote:
Originally Posted by gtstorey
It's your MAP sensor. Should be reading atmospheric pressure key on engine off.
are you saying my mao semsior is badQuote:
Originally Posted by SiriusC1024
It's either that, the wrong type, or wiring.
Hey. You also have a cam sensor code. Cam sensor drives the injectors, crank sensor for the ignition.
That should run without the cam sensor. If this is a no start we're talking about.Quote:
Originally Posted by SiriusC1024
And yeah the MAP is bad wrong. Need a part number off that thing.
I can't check your tune. What does it say that the ECM/Tune is from?Quote:
Originally Posted by Corvette Chris 39
2000 Silverado 6.0 2500Quote:
Originally Posted by gtstorey
So matching reluctor count so that isn't the issue for the cam code.
i changed the cam sensioe last night an im still getting the code . shoukld i try to change the map
part number is 09359409 3185Quote:
Originally Posted by edcmat-l1
just wanted to let yall know i figured out the problem with the car . i had the dam cam senor wire an map sensor wire backwards! my harness didnt come with a diagram so i had to look online an youtube as well
HAHAHA. Well glad you figured it out. Got a log?
Attachment 144541 let me know what you think pleaseQuote:
Originally Posted by SiriusC1024
Attachment 144542 i figured it out finally thank you for helping me . i really want to learn tuning! I try to read my books as much s possibleQuote:
Originally Posted by edcmat-l1
Click the badge to the bottom left of his username and leave some +feedback.
Now you need to get your O2 sensors working.
No problem. Good luck with it.Quote:
Originally Posted by Corvette Chris 39
Incidentally I'm getting ready to put an LSA in a C4. One of the nicest C4s I've seen since they were new LOL. A true unicorn.
Thats awespme man, when are you starting on it ? Mine has gave me hell but ive enjoyed working on it now i got to get t tuned so i can take it out the garage. ive been reading the book called tuning the right way by Bob Morreale and it all is so confusingQuote:
Originally Posted by edcmat-l1
I'll be starting on it in the next week or so. Got the engine sitting here along with most of the additional parts.Quote:
Originally Posted by Corvette Chris 39