lt1 high rpm sputter
#1
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lt1 high rpm sputter
I got 96 lt1 rebuilt le 228/236 cam 918 springs installed to le spec, long tubes headers, off y pipe ,bullet muffler and pcm for less tune.. shift point is 6300-6400. Rev limiter is 6500.. problem started after I done a alternator relocation. Now it sputters and surge above 5k but most times it's at 5800 to 6100 rpm..
I have changed alot opti, wires, plugs gapped 40, swapped coil, icm, fuel rail, checked fuel pressure soild 43 psi, no codes, nothing on data log, double checked valve lash it's 1/2 turn.. please help.. I'm bout to swap wiring harness make sure nothing is cut or something. .
I have changed alot opti, wires, plugs gapped 40, swapped coil, icm, fuel rail, checked fuel pressure soild 43 psi, no codes, nothing on data log, double checked valve lash it's 1/2 turn.. please help.. I'm bout to swap wiring harness make sure nothing is cut or something. .
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#9
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i redone the gounds and put extra one on. no help... i tried taking the bolt and spacer out at the opti on the alt relocation bracket and unhooked o2 when i was under there. it made full wot pull to 3rd gear. a (little) sputter at 5k.. a friend told me maybe maf is going bad.. thanks for input
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started doing it again. pluged back up o2s. tried cleaning and unhooked maf.. didnt help.. checked fuel pressure again.. 43 psi soild still. anymore ideas please
#13
Magnacore, Taylor are what many use. put dialectic grease inside opti & plug boots. run as factory did in brackets & looms
if after swapping/checking all the parts you have and still high RPM break-up....the opti is suspect (sensor)
your "economy" plug wires are suspect so as Caprice advises, get a quality set of plug wires
if after swapping/checking all the parts you have and still high RPM break-up....the opti is suspect (sensor)
your "economy" plug wires are suspect so as Caprice advises, get a quality set of plug wires
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Any tuning software or have you done just mail order tuning? Had this problem with our last mail order tune. Rev limiter was supposed to be 6700 and shift points @ 6000. Found the rev @ 5800 and shifts @ 6000. It was sputtering when it hit the fuel cuts, sounds similiar to your problem.
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Mail order.. I tried my old computer with cc305 does it to.. also car run great till I put relocation bracket on. Wires lay on top alternator. . Wondering if that cause a problem
#20
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Im running the relocated alternator as well and they come up around it in the holders with no issue at all, seems to be plenty of room. If thats all you changed and now you have a problem, must be some wire/alt interference.