OBDII conversion - troubleshooting time - Page 16 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 03-19-2008, 09:57 PM   #151
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Little late on my reply, but That is awesome that you got that working!

I reread most of this thread to get a bit of a better feel for what i'd be up to if I go the SII route.
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Old 03-19-2008, 10:22 PM   #152
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I had the chance to Stop By Brads house today and check out the new floor... And then took the SSEi FrankenPCM Bonnie for a Spin... I am impressed at the way it fires right up( Its scary the way it starts so incredibly easy )... And to drive it.... I never expected a 93 to be Soo responsive to the right foot.. Its got some guts to it for sure... The he was showing me what he was doing and looking at with the HP Tuner.... It was good to see that he could throw in the Tables he needed... I'll wait for him to do a few more things to the car and get some more fine tuning and they give another opinion.... But needless to say.... I was Impressed

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Old 03-20-2008, 07:03 AM   #153
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Boozie, for the most part you will do almost everything I have done....with the exception of modifying the harness to fit the engine. There are some thing I didn't post yet. However, it may be a very real possibility for me to do a writeup on the conversion process in general, for those wanting to do an S2 swap.

I still have the cruise control to deal with yet, and I still have to repair the AC. I am going to stick with the HR6 compressor for now. I see no reason the PCM can't control it. Oh, and EVAP needs to be plumbed in.

And if the Don says it'* good, that'* gotta tell you somethin' folks
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Old 03-28-2008, 09:51 PM   #154
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Maybe I should test before I speak of the wonders of the OBD2


Major issue cropped up today. Coincidentally, it is the first day I took the car over...35 mph. I get ZERO upshift from 2nd to 3rd (or fourth for that matter). Not even a hint of a shift.

Now for the kicker....I DO get third AND fourth when I use the VCM diagnostics in the HP Tuners suite, so electrically it'* all there. But for some strange reason, it refuses to shift when the PCM is given full control.

There is another thing that may or may not have any bearing on the issue. I am getting a TPS error, and it'* on the low side. Through the diagnostics, I can see that even at idle (closed throttle), the PCM sees the TPS at 5% open....which is WAY off. It'* an issue that I am going to correct regardless, but I was wondering if it has any bearing on the non-shifting issue.

Tomorrow I am going to be rehashing Bens .bin file...get it up to speed on my engine parameters and whatnot. I've got a fairly decent engine tune with the current OS right now, and getting those parameters transferred over will be cake. I'll know more tomorrow evening when I reflash the freakin' thing.
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Old 03-29-2008, 06:44 PM   #155
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My tps sensor was off by only 1-3% a few weeks ago, and under normal acceleration I could just about redline the motor before the pcm would command an upshift. As soon as I fixed the tps the problem went away.
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Old 03-29-2008, 07:15 PM   #156
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That may be my solution then. I'll have to check it again after I finish uploading this new tune.
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Old 03-30-2008, 09:24 AM   #157
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New info. Uploaded a revised tune, and took it for a spin. I was able to get it to shift to third, but with major slippage. Uploaded the previous tune...now it doesn't even want to shift out of first. Almost immediately TPS codes are thrown.

When the car warmed up, it would idle at 1300-1500....quite high considering I set the hot idle numbers at around 800. So, as a test, I unplug the TPS...idle goes down to 800 like it should. Great, so now I know the TPS really is bad. Right now, I can only assume the TPS is causing the transmission screwups, but I can't verify that until the TPS is fixed. And I don't know when that will be.
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Old 03-30-2008, 12:02 PM   #158
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Those were my symptoms exactly. 12-1500 rpm idle in gear and the transmission, if it didn't hold a gear then force a violent upshift, felt like a manual trans with a very weak clutch.
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Old 03-30-2008, 12:06 PM   #159
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Any difference between the resistance of the Series 1 TPS and the Series 2? I'll have to dig through my buckets and see if I have both.
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Old 03-30-2008, 01:19 PM   #160
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NFC. I know the connectors are different. The 1996 harness I modded had a different connector on it than what I could use, so I snipped, strippped, slagged, and bagged the old head onto it (slag and bag is slang for solder and heatshrink around the shop here).
However, both use the same 5 volt reference, so in that regard, the resistance values should be fine. But in case they are not...perhaps this would be an application best suited for the adjustable TPS
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