Troubleshooting help please.
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FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
Troubleshooting help please.
Went and picked up my moms 04 Navigator this afternoon. She hasn't been able to drive it because she says it has the "hiccups".
I took the scan tool up there assuming it would have the SES light on and a DTC or two, but it didn't.
During the 63 mile drive from her house to mine torque pro recorded a total of 6487 misfires. Still no check engine light, no individual misfire codes...... no codes at all.
Can/will a bad injector(s) create a misfire that the crank sensor can't see? Can a weak fuel pump cause this? I'm not sure where to start on this one. One thing I don't want to do is start shotgunning parts at it.
Anybody been here before?
I took the scan tool up there assuming it would have the SES light on and a DTC or two, but it didn't.
During the 63 mile drive from her house to mine torque pro recorded a total of 6487 misfires. Still no check engine light, no individual misfire codes...... no codes at all.
Can/will a bad injector(s) create a misfire that the crank sensor can't see? Can a weak fuel pump cause this? I'm not sure where to start on this one. One thing I don't want to do is start shotgunning parts at it.
Anybody been here before?
Hotshot
Joined: Jan 2004
Posts: 19,760
Likes: 1,079
From: St Louis
You need to look at the individual cylinder misfire counts in the Mode $06 data for situations where you have a "mild" or intermittent misfire situation.
The PCM will only set a MIL and corresponding DTC(s) when the rate of misfires exceeds a preset threshold.
The PCM will only set a MIL and corresponding DTC(s) when the rate of misfires exceeds a preset threshold.
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