Running rough below 2K rpm
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Running rough below 2K rpm
Just spent a beautiful Wisconsin summer weekend(WE GET 4-5 PER YEAR....) being up close & personal with my V10. It's an '01 Ex with 70k, 4x4, stock except for a K&N Filter.
It's always been a smooth runner, but when I started it the other morning, it had what felt like a miss at idle & under load up to about 2000 rpm, then smoothed out above that. No Codes. Cleaned the MAF, replaced plugs, checked the COPs & injectors with testers(ok). Checked for vacum leaks, but nothing readily apparent. Cleaned the IAC. No luck. I did notice that there were a few small cracks on a few of the boots at the very bottom, but none more than 1/8". Wondering if I might be getting a little spark loss/jump. The IAC wan't all that dirty and seemed to move freely, but I did notice that the disc wasn't seated - up off the seat about 1/16" or so. Plugged it in & turned on the ignition - no movement. Maybe it uses vacum to activate the solenoid so this may or may not indicate a bad one. Any other way to tell? Reading thru the threads here, it soesn't sound like a bad one would throw a code.
Anyway, just hoping some of you v-10 gurus can help shed some light on next steps.
Thanks,
Steve
It's always been a smooth runner, but when I started it the other morning, it had what felt like a miss at idle & under load up to about 2000 rpm, then smoothed out above that. No Codes. Cleaned the MAF, replaced plugs, checked the COPs & injectors with testers(ok). Checked for vacum leaks, but nothing readily apparent. Cleaned the IAC. No luck. I did notice that there were a few small cracks on a few of the boots at the very bottom, but none more than 1/8". Wondering if I might be getting a little spark loss/jump. The IAC wan't all that dirty and seemed to move freely, but I did notice that the disc wasn't seated - up off the seat about 1/16" or so. Plugged it in & turned on the ignition - no movement. Maybe it uses vacum to activate the solenoid so this may or may not indicate a bad one. Any other way to tell? Reading thru the threads here, it soesn't sound like a bad one would throw a code.
Anyway, just hoping some of you v-10 gurus can help shed some light on next steps.
Thanks,
Steve
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FWIW, my 03 acted the same way when i bought it with 66,000 on it, but it would only do it when it had been running for a little while, ended up being #5 cop. I just had my IAC off but never turned the key on to see if it moved, sounds like a possability. I'm sure someone else will chime in with a little more info on that though
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Been gone alot so the Ex has been parked. Replaced plugs, cops, scanner finally showed a missfire on #10. The plug looked fouled/brown, but not oily. Put in new plug, no luck. Switched cop & plug out with Front cyl. and still no luck. Swapped the injectors and STILL no luck. Checked the compression again & still good. No valvetrain noise.
I haven't invented any new cusswords yet but am sure finding new ways to string them together....
As always, any new ideas are appreciated.
I haven't invented any new cusswords yet but am sure finding new ways to string them together....
As always, any new ideas are appreciated.
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FOUND IT!!!!!!!
Took the truck over to a friend with all the tools & toys and checked the #10 injector with a noid - wasn't flashing. Thought the injector was working properly because a flash tester showed it to be pulsing and I could hear it clicking with the stethoscope. Turned out to be a broken ground wire right where the #10 wires came out of the harness. Go figure.
I hope this'll make somebody's next troubleshooting job a little easier.
Steve
Took the truck over to a friend with all the tools & toys and checked the #10 injector with a noid - wasn't flashing. Thought the injector was working properly because a flash tester showed it to be pulsing and I could hear it clicking with the stethoscope. Turned out to be a broken ground wire right where the #10 wires came out of the harness. Go figure.
I hope this'll make somebody's next troubleshooting job a little easier.
Steve
