school me
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Joined: Mar 2007
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From: Pa
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More Turbo
Joined: Jul 2009
Posts: 705
Likes: 12
From: Taxachusetts
update.
I changed from the 93 perf. tune to 87 econo tune, the truck kept stalling, bucking and surging. went back to stock ran ok. still getting 4-5 mpgs. going to try to check the plugs and get a cam cover off today.
I changed from the 93 perf. tune to 87 econo tune, the truck kept stalling, bucking and surging. went back to stock ran ok. still getting 4-5 mpgs. going to try to check the plugs and get a cam cover off today.
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More Turbo
Joined: Jul 2009
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From: Taxachusetts
got the plugs 6-10 out all looked the same brownish rust color pulled #1 for comparison looked the same. ran out of time to get the cam cover off, my 8 &5 year old demanded my attention. tried my econo tune, bucked surged and stalled. going to try my 87 tow tune.
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More Turbo
Joined: Jul 2009
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From: Taxachusetts
update
got the cam cover off. not that I know what I'm looking for, but everything looked the same. no metal shavings, chunks etc. everything tight including the chain. put a wrench on the cam gear nut eased it back and forth no rotation.
Krewat, I know I should stay with stock tune, but I can't leave well enough alone. I put my 87 tow tune in, ran better but still pinged a little. took 2*global, 2* 0-2000 out. power is up economy is up, not where it should be but better.
while changing the tunes, I heard my fuel pump running (dumba$$) quickly pulled the fuse. I don't remember pulling the fuse the last couple of times I've changed or adjusted the tune. could I have hurt something, exacerbating my problems????
got the cam cover off. not that I know what I'm looking for, but everything looked the same. no metal shavings, chunks etc. everything tight including the chain. put a wrench on the cam gear nut eased it back and forth no rotation.
Krewat, I know I should stay with stock tune, but I can't leave well enough alone. I put my 87 tow tune in, ran better but still pinged a little. took 2*global, 2* 0-2000 out. power is up economy is up, not where it should be but better.
while changing the tunes, I heard my fuel pump running (dumba$$) quickly pulled the fuse. I don't remember pulling the fuse the last couple of times I've changed or adjusted the tune. could I have hurt something, exacerbating my problems????
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Brett Foote
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Joined: Jul 2002
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From: Long Island USA
They say to pull the fuel pump fuse just in case it comes on when you are uploading/flashing the tune. In case there is not enough battery power, you could ruin the PCM because the tune doesn't fully upload and after that the computer crashes.
If it runs, I'd think it's fine. Just reupload the tune again to be sure, with the fuel pump fuse out.
Funny that retarding the timing 2-4 degrees made an increase in power.
I'd start wondering if the crank/cam sensors are flakey and firing off at the wrong time.
If it runs, I'd think it's fine. Just reupload the tune again to be sure, with the fuel pump fuse out.
Funny that retarding the timing 2-4 degrees made an increase in power.
I'd start wondering if the crank/cam sensors are flakey and firing off at the wrong time.
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More Turbo
Joined: Jul 2009
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From: Taxachusetts
I'm guessing it's not pinging with the 4* pulled out so it's running better??????
I did get 6.5 mpgs on my last fill up. is it possible the pcm is screwed up? would a reflash of the pcm fix it??
I did get 6.5 mpgs on my last fill up. is it possible the pcm is screwed up? would a reflash of the pcm fix it??
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More Turbo
Joined: Jul 2009
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From: Taxachusetts
well, in the midst of another snow storm I got the pcm reflashed with the latest and greatest factory version. see what happens.
what should my cylinder head temp readings be? datalogging shows it to be 200-210*, I do have a 195* in it, and that seems right to my logic, but...
what should my cylinder head temp readings be? datalogging shows it to be 200-210*, I do have a 195* in it, and that seems right to my logic, but...
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More Turbo
Joined: Jul 2009
Posts: 705
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From: Taxachusetts
another update
after the the pcm reflash the next fillup I got 10.2 mpgs. power isn't any better. put the 87 ecno tune in for s&g's. didn't run right, much less dramatic surging and stalling. put 87 tow tune in runs good! power is better only have about 100 miles in this tank but it's looking like my mpgs are up from 5 to possibly double digits. now if it would grow some gonads I would be a happy camper!
datalogging shows the same as before except my long term fuel trims stay closer and fluctuate less. if I start another slow decent in economy, my opinion would be a faulty pcm. arguments for or against that?????
after the the pcm reflash the next fillup I got 10.2 mpgs. power isn't any better. put the 87 ecno tune in for s&g's. didn't run right, much less dramatic surging and stalling. put 87 tow tune in runs good! power is better only have about 100 miles in this tank but it's looking like my mpgs are up from 5 to possibly double digits. now if it would grow some gonads I would be a happy camper!
datalogging shows the same as before except my long term fuel trims stay closer and fluctuate less. if I start another slow decent in economy, my opinion would be a faulty pcm. arguments for or against that?????
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
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From: Long Island USA
If you had the PCM reflashed, the calibration is certainly going to be different, and you have to go back to the tuner (Mike?) and get new tunes based on the calibration code.
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More Turbo
Joined: Jul 2009
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From: Taxachusetts
Wow is Mike fast! called him up, explained what was going on, he told me he would revise my tunes and fix my 87 econo tune and email them to me. strapped on the plow, scraped up some ice and cleared the town plow leavings from the road widening and they were done! uploaded them to the sct put the econo tune in the truck so far runs better than it has in while. only been about 35 miles since I put the revised tune in, cautiously optimistic.
thanks Mike you rock!
thanks Mike you rock!