LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

RPM Surging

Old Dec 23, 2011 | 05:20 AM
  #16  
Injuneer's Avatar
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Re: RPM Surging

If the code came back, you didn't fix the problem. Did you make all the checks outlined in Shoebox's writeup? Did you have 5V reference voltage on the harness wires?

Rather than pull the battery cable off, pull the "PCM BAT" fuse for 30 seconds to clear the codes.
Old Dec 23, 2011 | 11:53 AM
  #17  
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Re: RPM Surging

I'm pretty sure I checked everything, I'll go back and check again. I had 5 volts at the plug so that tells me things are ok with the harness.
Old Dec 23, 2011 | 06:14 PM
  #18  
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Re: RPM Surging

Originally Posted by camz28ryan
Ok thanks 2quik, can you recommend a tuner? I wasn't going to mail order I was going to drive the car to tulsa, the tuner said it would be better than a mail order.
Which tuner? Did Ed say he could dyno tune it somewhere? If dyno tuned, but be sure they are tuning it for all load conditions not just WOT.
No don't have a tuner to recommend, I tuned my own after getting and learning how to use a scan tool and a tuner for another car.

Originally Posted by camz28ryan
Can someone send me a link to test the 02's? Wouldn't it throw a code if the 02's were bad??
No link, I already told you how to check them with a scan tool. You never said if its still an OBD2 PCM or if it was converted to OBD1, my experience has been that OBD2 will throw a code pretty quick when they get lazy, OBD1 not so much if ever on the ones i've had fail.
Old Dec 23, 2011 | 06:56 PM
  #19  
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Re: RPM Surging

I get it, I need a tuner and I agree that would be ideal, however at present time I have no money to spend on equipment. I've read somewhere on this site how to test 02's without a tuner. If someone knows what thread it's in I would appreciate it.

It's OBD2.

Ed no longer Dyno tunes. I am looking for someone to idle tune the car and get the dyno done at a later date.

After thought: How difficult is it to learn how to use a tuner so I can tune it myself. If it's not to difficult I may dicide to buy a tuner like you suggested and do it myself. What tuner is the best one to buy?
Old Dec 23, 2011 | 10:15 PM
  #20  
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Re: RPM Surging

You don't want an "idle" tune. You want the PCM tuned for the complete range of operation, right from the start. Any mail-order tuner can do what you need, and get it "close". Then find a dyno tuner and get it "exact".

Tuning software for an OBD-II PCM is going to cost you more than a mail-order tune. Look at "JET Dynamic Spectrum Tuner for 96/97 LT1".

You will also need scanning software, and you could use that to monitor O2 sensor operation and determine if they are operating correctly. Look at AutoTap OBD-II software.

Last edited by Injuneer; Dec 23, 2011 at 10:19 PM.
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