got some new codes...can you help? - Page 8 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 04-22-2008, 02:38 PM   #71
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Yes, just any convenient ground.
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Old 04-22-2008, 03:23 PM   #72
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ok i will get back to you the next time i can check...some time after 7pm CST


thanks for all your help
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Old 04-22-2008, 03:32 PM   #73
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Quote:
Originally Posted by Triple X
Pin C (harniss) to ground i got 5v
resistance Pin B (harniss) it was off the chart....

PCM i did not check bcause i need to know what i am grounding it to...i know to check BD14 (yellow wire) but do i just ground it to the door frame or somthing?
Make sure you have ignition off when checking resistance.
Pin C reading is different than before and now correct.
Finally, GROUND; there is a stud on the firewall passenger side, where the fiber panel is that hides the heater/ac/computer. That is a known good ground and very handy.
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Old 04-22-2008, 09:59 PM   #74
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ok here is the rest....

resistance of pin B is still off the chart...the needle goes to 0 or less. (with car off)

voltage for PCM is 5v

hope this helps...if we cant figure out what is up with this by this weekend then i will just have to take it in but i hope not to do that...lol

get back soon

thanks for all your help

jason
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Old 04-23-2008, 12:51 AM   #75
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ZERO resistance is GOOD for Pin B, and you now have 5V at the proper connector pin on the MAF and at the PCM. You also have 12V to the MAF sensor.

Let'* step back now and update us on the CURRENT codes and symptoms.
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Old 04-23-2008, 11:26 AM   #76
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same.... with the harness unplugged.... code 34 and car runs fine.

plugged in... code 34 and car runs crappy (idles bad or just dies)... nothing is different
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Old 04-23-2008, 03:21 PM   #77
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thinking about it....it seams that the MAF is the only thing i can think of that we were not able to test...that could be bad...what do you guys think?
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Old 04-24-2008, 01:03 AM   #78
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well i am still waiting on someone to tell me whats up....but i went to the auto parts store and exchanged the MAF for a new one....sooooo. now i dont know whats up...i think it worked but there is still weird stuff going on..... first off just like be for...when i put the new MAF in the Check engine light turned off. i took it for a test drive tonight and it did not die this time but the idle was still hit or miss and when i would drive and try to accelerate and increase my boost...it would stutter...i would have my foot to the floor and i would get no acceleration...but then some times it would be fine...until it sputters again...and at stop signs or lights...my idle would drop and the car would be vary close to dieing. it would idle just under 1000 rpm and out of no ware it would correct it self for a little wile and put it at about 1200rpm...then go back down again...when it is vary close to dieing the car shakes..not wildly but enough to feel it....

can anybody figure this out?
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Old 04-24-2008, 01:06 AM   #79
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oh and just to put up my 100th post...and to tell you all that if it helps my ABS light and my TRAC light are on too...but i dont think that makes a difference.
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Old 04-24-2008, 10:31 AM   #80
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Quote:
Originally Posted by Triple X
when i put the new MAF in the Check engine light turned off. i took it for a test drive tonight and it did not die this time but the idle was still hit or miss and when i would drive and try to accelerate and increase my boost...it would stutter...i would have my foot to the floor and i would get no acceleration...but then some times it would be fine...until it sputters again...and at stop signs or lights...my idle would drop and the car would be vary close to dieing. it would idle just under 1000 rpm and out of no ware it would correct it self for a little wile and put it at about 1200rpm...then go back down again...when it is vary close to dieing the car shakes..not wildly but enough to feel it....

can anybody figure this out?
I've been trying to watch from the side and let Willwren follow through on his plan. But I can get you started on a suspect area.
I'm thinking you may have multiple problems. As I learned from Willwren (gotta give him the credit) crapping out under acceleration/load is often ignition related. And your poor idle may be another indicator of this. Here is a quick and easy check to see if you have one or more cylinders that are not up to par in the ignition department.
  • 1. Start motor and let it calm down a little (should only take a few seconds to a min. or so)
    2. Unplug the IAC valve (near the TPS on the throttle body and is a black cylinder shaped item)... not to exceed 2 min. at a time.
    3. Pull the plug wires off at the coils one at a time while listening for a change in idle. The miss will either get worse or stay the same. Of course, when the miss does NOT get worse with a wire off, that is one of your bad plugs, wires or coils. I'm a chicken, so I like to use rubber handled pliers and rubber gloves. It will still give you a little tickle when the wire is put back on.
    OR, an option would be to shut it off in between, put the wire back on and then restart to check the next one and so on. It needs to be running when you pull one though, it will be more apparent if you get a change or not. Plus the "tickle" doesn't come when you remove the wire, it'* when you put it back on.
    4. When you pull a wire off a GOOD coil output, it is normal for arcing back to the coil body. So, if it does NOT arc, suspect an issue with that coil output. It can be bad on one output of the two and the other to work okay.
    If you suspect a coil, you can do a resistance measurement across the 2 output terminals. I believe it would be around 15k ohms on a good one; or infinity (open) on a zapped one.
If the above check exposes a problem, items failing that would cause a discernible MISS would be in this order
1. Plug Wires
2. Coil(*)
3. Plugs (for one to actually stop firing it has to be REAL bad and is often a result of something else... not to say they don't need to be replaced regularly for good performance).

Let us know what you find on this check and we can go from there... or Willwren can ...
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