epike7915
09-06-2006, 08:08 PM
my post on zuwharrie and update post---HELP!!
http://bbs.zuwharrie.com/content/topic,44109.0.html
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UPDATE: Still PISSING ME OFF!
-Tightened & added grounds from dist to block, block to battery, battery to firewall and grounds by ecm to firewall.
-Adjusted valves all pretty good one #4 exhaust valve was tight so we fixed that
-Checked compression, all with in specs 1-3 155psi #4 135 psi
-Checked timing was good at 8* degrees per Haynes manual. Total advance at 3500 rpm ~33* degrees total
The miss/backfire is coming on at just above 5500 rpm at a free rev or under load at same or close rpm. It sure sounds like it is popping bad out of exhaust/tailpipe.
We did notice when check total advance just as the motor would start to backfire it would show a drop in timing somewhere from 5-10* degrees, as if something was pulling timing out of it or above that 5500 rpm threshold... The only code it is pulling is p0135 which in our book shows #1 o2 sensor HEATER CIRCUIT MALFUNCTION. So I bought a new $100 front O2 and reset computer and same problem and the code came back on.
As an "old school thought/test" per my old man , we even tried unhooking the front (#1) O2 to see if anything changed as far as running or idling or timing and none of these changed. It ran Exactly the same. In my dad's "old school" thinking it he points out that either that o2 or that o2 circuit is messed up (BACK TO THE p0135 code?) Anyone know EXACTLY what this code is saying and what controls/sends this code, some sensor, wiring or ECM???
I need to mention that this was not a "Trail Tough" harness it was done by a mechanic friend that has done 3 or more of these without this particular problem. He did note to me that this ECM was different then any he has done by it having 3 plugs at the ECM, (again it was out of a 96 tracker with automatic). Also, there is no VSS hooked up to speedo and the 2nd (rear 02) is not hooked up (but I don't believe either of these would cause this)
Any input thoughts are DEEPLY appreciated! I am going to a pretty big pig roast/ 4 wheeling party this weekend where there will be alot of HEEPS and I can't have this poop popping and backfiring everytime I need to kick it in the [censored] thru deep mud or high/loose hill climb that I can't crawl. (CRAWLING IS NOT AN ISSUE!)
Eric
http://bbs.zuwharrie.com/content/topic,44109.0.html
--------------------------------------------------------------------------------
UPDATE: Still PISSING ME OFF!
-Tightened & added grounds from dist to block, block to battery, battery to firewall and grounds by ecm to firewall.
-Adjusted valves all pretty good one #4 exhaust valve was tight so we fixed that
-Checked compression, all with in specs 1-3 155psi #4 135 psi
-Checked timing was good at 8* degrees per Haynes manual. Total advance at 3500 rpm ~33* degrees total
The miss/backfire is coming on at just above 5500 rpm at a free rev or under load at same or close rpm. It sure sounds like it is popping bad out of exhaust/tailpipe.
We did notice when check total advance just as the motor would start to backfire it would show a drop in timing somewhere from 5-10* degrees, as if something was pulling timing out of it or above that 5500 rpm threshold... The only code it is pulling is p0135 which in our book shows #1 o2 sensor HEATER CIRCUIT MALFUNCTION. So I bought a new $100 front O2 and reset computer and same problem and the code came back on.
As an "old school thought/test" per my old man , we even tried unhooking the front (#1) O2 to see if anything changed as far as running or idling or timing and none of these changed. It ran Exactly the same. In my dad's "old school" thinking it he points out that either that o2 or that o2 circuit is messed up (BACK TO THE p0135 code?) Anyone know EXACTLY what this code is saying and what controls/sends this code, some sensor, wiring or ECM???
I need to mention that this was not a "Trail Tough" harness it was done by a mechanic friend that has done 3 or more of these without this particular problem. He did note to me that this ECM was different then any he has done by it having 3 plugs at the ECM, (again it was out of a 96 tracker with automatic). Also, there is no VSS hooked up to speedo and the 2nd (rear 02) is not hooked up (but I don't believe either of these would cause this)
Any input thoughts are DEEPLY appreciated! I am going to a pretty big pig roast/ 4 wheeling party this weekend where there will be alot of HEEPS and I can't have this poop popping and backfiring everytime I need to kick it in the [censored] thru deep mud or high/loose hill climb that I can't crawl. (CRAWLING IS NOT AN ISSUE!)
Eric