RPM errors - Help
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Joined: Jul 1999
Posts: 407
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From: Stuarts Draft, VA
Car: 88 GTA
Engine: modified L98
Transmission: 700r4
Axle/Gears: 3.27 9-bolt
RPM errors - Help
Over the past week or so my car has developed a "buck" in it. Every once in a while it just jerks for no reason. I noticed that whenever it does it my tach jumps up a few hundred RPM. So last night I took a long drive with Craig's software and found out that the RPM signal is jumping all over the place. The whole drive was below 2500 RPM - yet a good portion of the tach signal was over 4000 RPM, even over 6000 RPM a few times.
Does anyone have any idea what could be causing this? I don't really think it's PROM related - but I've been messing with it so much lately maybe I screwed something up by accident.
TIA,
Scott
Does anyone have any idea what could be causing this? I don't really think it's PROM related - but I've been messing with it so much lately maybe I screwed something up by accident.
TIA,
Scott
Supreme Member
Joined: Jun 2000
Posts: 7,554
Likes: 1
From: In reality
Car: An Ol Buick
Engine: Vsick
Transmission: Janis Tranny Yank Converter
<font face="Verdana, Arial" size="2">Originally posted by Scott 88 GTA:
Over the past week or so my car has developed a "buck" in it. Every once in a while it just jerks for no reason. I noticed that whenever it does it my tach jumps up a few hundred RPM. So last night I took a long drive with Craig's software and found out that the RPM signal is jumping all over the place. The whole drive was below 2500 RPM - yet a good portion of the tach signal was over 4000 RPM, even over 6000 RPM a few times.
Does anyone have any idea what could be causing this? I don't really think it's PROM related - but I've been messing with it so much lately maybe I screwed something up by accident.
</font>
Over the past week or so my car has developed a "buck" in it. Every once in a while it just jerks for no reason. I noticed that whenever it does it my tach jumps up a few hundred RPM. So last night I took a long drive with Craig's software and found out that the RPM signal is jumping all over the place. The whole drive was below 2500 RPM - yet a good portion of the tach signal was over 4000 RPM, even over 6000 RPM a few times.
Does anyone have any idea what could be causing this? I don't really think it's PROM related - but I've been messing with it so much lately maybe I screwed something up by accident.
</font>
Bruce
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Member
Joined: Jul 1999
Posts: 407
Likes: 0
From: Stuarts Draft, VA
Car: 88 GTA
Engine: modified L98
Transmission: 700r4
Axle/Gears: 3.27 9-bolt
Thanks Bruce, I think you hit the nail on the head. I measured the resistance of the #1 and #3 wires tonight, which have the most clearance around my headers, and they were both over 12k ohms.
Now where's my Summit catalog.....
Now where's my Summit catalog.....
Supreme Member
Joined: Jun 2000
Posts: 7,554
Likes: 1
From: In reality
Car: An Ol Buick
Engine: Vsick
Transmission: Janis Tranny Yank Converter
<font face="Verdana, Arial" size="2">Originally posted by Scott 88 GTA:
Thanks Bruce, I think you hit the nail on the head. I measured the resistance of the #1 and #3 wires tonight, which have the most clearance around my headers, and they were both over 12k ohms.
Now where's my Summit catalog.....</font>
Thanks Bruce, I think you hit the nail on the head. I measured the resistance of the #1 and #3 wires tonight, which have the most clearance around my headers, and they were both over 12k ohms.
Now where's my Summit catalog.....</font>
Crane, and MSD iin that order as alternatives in my book.
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