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03-04-2013, 10:33 PM
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#126
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Join Date: Jan 2007
Location: Southeast, PA / Brick, NJ (Lost due to Sandy)
Posts: 238
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Quote:
Originally Posted by stealth355tpi
so you still dont know wither its fuel or spark? maybe try a injector test noid or start pulling the wire loom off to look for broken or chewed wires.
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Ran the noid a few times. No issues.
Per GM:
__________________
-Rick (Photographer)
- 2001 Trans AM WS6 - M6, ORY, Borla catback, etc.
- 1998 Trans Am - M6, functional Ram Air hood, Flowmaster, 3" QTP E-cutout, ORY, K&N FIPK, 3.42's, LSD, Hella 60mm Projectors, 4300K HID's & more.
- 2003 VW Golf TDI - Turbo diesel @ 50 MPG highway
- 1998 Jeep Grand Cherokee 5.9L(ZJ) - 4.75" lift, 32" MTZ's, armor, etc.
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03-05-2013, 12:26 AM
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#127
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Join Date: Mar 2012
Location: Harrison NJ
Posts: 880
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did you start the car withthe cover off to confirm it wasnt mechanical. have you swapped the whole coil bracket?
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03-05-2013, 07:22 AM
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#128
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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Have you tried swapping the ignition wires around?
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03-05-2013, 08:29 AM
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#129
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Join Date: Jan 2007
Location: Southeast, PA / Brick, NJ (Lost due to Sandy)
Posts: 238
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There is spark per GM. I swapped in an LQ4 row of coils and that didn't change anything. It's not the coils or those wires. I did not start the car with the valve cover off. I didn't know to do that. I'm definitely not a mechanic lol.
I am going to swap in the Crank Position Sensor from my '01 to see if that changes anything. My buddy had his go bad on a few vehicles and it causes similar issues.
__________________
-Rick (Photographer)
- 2001 Trans AM WS6 - M6, ORY, Borla catback, etc.
- 1998 Trans Am - M6, functional Ram Air hood, Flowmaster, 3" QTP E-cutout, ORY, K&N FIPK, 3.42's, LSD, Hella 60mm Projectors, 4300K HID's & more.
- 2003 VW Golf TDI - Turbo diesel @ 50 MPG highway
- 1998 Jeep Grand Cherokee 5.9L(ZJ) - 4.75" lift, 32" MTZ's, armor, etc.
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03-05-2013, 08:41 AM
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#130
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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So the actual ignition wires have been moved to different cylinders or completely replaced?
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03-05-2013, 09:09 AM
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#131
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Stalker
Join Date: Aug 2004
Posts: 12,077
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not sure if feasible... but could you program the ecm firing over such that 5&7 become 1&3? THEN switch the plug wires and injector connectors so that actual firing order is correct?... then if it still shows a 5/7 miss you know its mechanical, if now 1/3 you know its electrical.
Last edited by V; 03-05-2013 at 09:10 AM.
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03-05-2013, 10:05 AM
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#132
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Join Date: Mar 2007
Location: NJ
Posts: 540
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May be a waste of time but have you had a vacuum gauge on the engine (must be a mechanical gauge with a needle)? Different conditions will cause the needle on the gauge to react differently.
http://www.broncolinks.com/gallery_i...osisCraigU.JPG
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03-05-2013, 09:01 PM
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#133
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Join Date: Jan 2007
Location: Southeast, PA / Brick, NJ (Lost due to Sandy)
Posts: 238
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Thanks guys - just wanted to post this. Finally got to #8 tonight... wow:
Car idles a lot better, drives a lot better, but is still missing on 5 & 7.
__________________
-Rick (Photographer)
- 2001 Trans AM WS6 - M6, ORY, Borla catback, etc.
- 1998 Trans Am - M6, functional Ram Air hood, Flowmaster, 3" QTP E-cutout, ORY, K&N FIPK, 3.42's, LSD, Hella 60mm Projectors, 4300K HID's & more.
- 2003 VW Golf TDI - Turbo diesel @ 50 MPG highway
- 1998 Jeep Grand Cherokee 5.9L(ZJ) - 4.75" lift, 32" MTZ's, armor, etc.
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03-05-2013, 09:05 PM
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#134
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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That may give you some more insight into cyls 5 and 7. That's a lot of crud.
Maybe a top end clean/seafoam is in order?
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03-06-2013, 01:11 AM
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#135
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Join Date: Mar 2012
Location: Harrison NJ
Posts: 880
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pull the covers and start the car
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03-06-2013, 07:18 AM
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#136
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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Yeah that's a lot of carbon deposit. Did it reek of fuel? I would do a top end clean or two.
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03-06-2013, 03:01 PM
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#137
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Join Date: Jan 2007
Location: Southeast, PA / Brick, NJ (Lost due to Sandy)
Posts: 238
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UPDATE: SO, I think I may have found the issue, or a big part of it. I decided today to check things I have checked already, just in case I missed something, or see if anything changed. On my way home I stopped, unplugged the MAF, reset the codes on the PCM with my Torque app, and drove. WOW.... what a difference. CEL is not blinking, it's not even on anymore. I drove it 25 miles home. The car still has minor hesitation but no big misfire. Check out these screen shots:
I'll order up a new MAF and see if that fixes things completely!
__________________
-Rick (Photographer)
- 2001 Trans AM WS6 - M6, ORY, Borla catback, etc.
- 1998 Trans Am - M6, functional Ram Air hood, Flowmaster, 3" QTP E-cutout, ORY, K&N FIPK, 3.42's, LSD, Hella 60mm Projectors, 4300K HID's & more.
- 2003 VW Golf TDI - Turbo diesel @ 50 MPG highway
- 1998 Jeep Grand Cherokee 5.9L(ZJ) - 4.75" lift, 32" MTZ's, armor, etc.
Last edited by GhostDakota; 03-06-2013 at 03:02 PM.
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03-06-2013, 03:17 PM
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#138
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Is your MAF descreened? I forget if I asked that.
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03-06-2013, 03:19 PM
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#139
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Join Date: Jan 2007
Location: Southeast, PA / Brick, NJ (Lost due to Sandy)
Posts: 238
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Quote:
Originally Posted by WildBillyT
Is your MAF descreened? I forget if I asked that.
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The '01's is, the '98 is not.
__________________
-Rick (Photographer)
- 2001 Trans AM WS6 - M6, ORY, Borla catback, etc.
- 1998 Trans Am - M6, functional Ram Air hood, Flowmaster, 3" QTP E-cutout, ORY, K&N FIPK, 3.42's, LSD, Hella 60mm Projectors, 4300K HID's & more.
- 2003 VW Golf TDI - Turbo diesel @ 50 MPG highway
- 1998 Jeep Grand Cherokee 5.9L(ZJ) - 4.75" lift, 32" MTZ's, armor, etc.
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03-06-2013, 04:21 PM
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#140
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BadMod
Join Date: Aug 2004
Location: hamilton, nj
Posts: 8,889
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Bad Maf does some crazy stuff. Just changed the one on the trailblazer. It was causing major shifting issues
__________________
So much stupid, so little time.
Quote:
Originally Posted by 79CamaroDiva
It started before I drove your car. I just have to look at it the wrong way and your car poops parts.
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Mercerville MotorSports, LLC
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03-06-2013, 04:32 PM
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#141
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Join Date: Jul 2009
Location: North Jersey
Posts: 464
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glad your getting closer to fixing this, black magic stinks
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03-06-2013, 04:45 PM
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#142
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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I'd be leery of that fixing the issue, I hope it does though! Unplugging the maf will force the computer to use default spark and fuel tables. I'm not sure it will be able to calculate fuel trims either since its not reading air in. I could be mistaking though and I hope it is the issue!
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03-06-2013, 05:06 PM
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#143
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Join Date: Mar 2012
Location: Harrison NJ
Posts: 880
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Yeah if it was a bad maf it wouldn't be a constant 5&7 miss
Now the carbon deposit looks to be signs of babying the car way too much
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03-06-2013, 05:18 PM
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#144
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Join Date: Jan 2007
Location: Southeast, PA / Brick, NJ (Lost due to Sandy)
Posts: 238
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Whatever the case, after 45 minutes of driving (25 miles) the CEL is off. EVERY other time I reset the PCM codes the CEL light came on within 1 minute, and flashed immediately when it hit 30+ MPH. I need to hook it up to EFI Live again and see what's going on.
__________________
-Rick (Photographer)
- 2001 Trans AM WS6 - M6, ORY, Borla catback, etc.
- 1998 Trans Am - M6, functional Ram Air hood, Flowmaster, 3" QTP E-cutout, ORY, K&N FIPK, 3.42's, LSD, Hella 60mm Projectors, 4300K HID's & more.
- 2003 VW Golf TDI - Turbo diesel @ 50 MPG highway
- 1998 Jeep Grand Cherokee 5.9L(ZJ) - 4.75" lift, 32" MTZ's, armor, etc.
Last edited by GhostDakota; 03-06-2013 at 05:18 PM.
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03-06-2013, 06:14 PM
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#145
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Join Date: Mar 2011
Location: Morris County
Posts: 1,033
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Post #36. You said you checked all that out. ????????
__________________
94 Trans am 25th anniversary
86 Buick Regal T-type
73 camaro 454/T56 work in progress.
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03-06-2013, 06:16 PM
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#146
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Join Date: Mar 2011
Location: Morris County
Posts: 1,033
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Doesn't the car remain in open loop when maf is unplugged which means it not using the O2 readings.
__________________
94 Trans am 25th anniversary
86 Buick Regal T-type
73 camaro 454/T56 work in progress.
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03-06-2013, 10:33 PM
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#147
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Join Date: Mar 2012
Location: Harrison NJ
Posts: 880
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Quote:
Originally Posted by grazi
Doesn't the car remain in open loop when maf is unplugged which means it not using the O2 readings.
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ehhhhh it goes to its back up and uses the map sensor
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03-07-2013, 09:53 AM
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#148
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Join Date: Jan 2007
Location: Southeast, PA / Brick, NJ (Lost due to Sandy)
Posts: 238
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It's definitely not fixed 100%, but the blinking misfire is gone. No P0300 code. Only code is for the MAF being disconnected. When it's warm it still idles pretty rough and wants to die at stops (though it hasn't). But once it's warmed up I'd say it's about 85% better than with the MAF plugged in. I'm going to have my AIR and EGR tuned out, to see if that further helps things as well. Anyone have a confirmed working '98 LS1 MAF for sale? :P
__________________
-Rick (Photographer)
- 2001 Trans AM WS6 - M6, ORY, Borla catback, etc.
- 1998 Trans Am - M6, functional Ram Air hood, Flowmaster, 3" QTP E-cutout, ORY, K&N FIPK, 3.42's, LSD, Hella 60mm Projectors, 4300K HID's & more.
- 2003 VW Golf TDI - Turbo diesel @ 50 MPG highway
- 1998 Jeep Grand Cherokee 5.9L(ZJ) - 4.75" lift, 32" MTZ's, armor, etc.
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03-07-2013, 10:00 AM
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#149
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Join Date: Jan 2013
Location: Washington Crossing, PA
Posts: 51
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Try switching the maf from your other car then and see what it does.
__________________
2000 Camaro SS M6 #6244 of 8913
Got BOOST?
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03-07-2013, 10:08 AM
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#150
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Join Date: Mar 2012
Location: Harrison NJ
Posts: 880
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i hve a maf for sale. on my forsale thread.
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