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Old 06-27-2013, 11:54   #1 (permalink)
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1999 Navigator EGR issue, really unexplainable.

Ok 1999 Navigator 32v. P1401. Changed dpfe and egr solenoid vacuum valve. Egr will kill engine with full vacuum.

Only runs poorly at first start idle/run for two minutes. During this entire time the egr voltage max's out at 89.9 and with gas applied with none it reads 0. The amount of pressure applied to the pedal does not matter. The EGR voltage pegs straight out, but just for the first two minutes of a cold start. After that the EGR voltage remains where it should be at zero for the rest of the drive.


Anyone explain why the EGR is pegging straight out?

I was A.S.E certified ten years ago, its got me stumped. I thought maybe a programming error or a problem with the pcm. But I changed it with a known good pcm and it still does the exact same thing.

Also I used a voltage meter and did all the proper tests. All the parts are within spec.

This is a truck I bought at auction because it looked in great shape and ran great.

The data stream is perfect too. O2's switching, intake airflow is correct, tps accurit, everything is correct.


All of the parts are within spec.

I live in California, and if the check engine light is on, the state gives you problems.



Any idea's?


It's almost like a built in "wait to drive" feature. lol.
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Old 06-27-2013, 19:26   #2 (permalink)
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Re: 1999 Navigator EGR issue, really unexplainable.

Are you reading on the brown-lt green? I'm assuming that's a typo and it's 8.99 VDC. Not sure if it would affect it, but the TPS is also tied into the common for the DPFE, what's it doing?
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Old 06-27-2013, 19:39   #3 (permalink)
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Re: 1999 Navigator EGR issue, really unexplainable.

I unplug the vacuum to the egr it stops stumbling. Plug it back in and as the intake vacuum increases the egr opens. I think the valve that opens is stuck open providing vavuum to the egr as engine speeds increase. But Im still trying to figure it out.
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Old 06-28-2013, 18:43   #4 (permalink)
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Re: 1999 Navigator EGR issue, really unexplainable.

Is it fed by a valve that looks like this?

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Old 06-28-2013, 22:32   #5 (permalink)
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Re: 1999 Navigator EGR issue, really unexplainable.

No, its a inntech 32 valve.
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Old 06-29-2013, 10:22   #6 (permalink)
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Re: 1999 Navigator EGR issue, really unexplainable.

Okie doke, suggestion still applies, follow the EGR to the solenoid that sends its vacuum signal to the EGR and unplug it, see f it acts like you've unplugged the EGR, if not, it's either leaking or stuck open. If it doesn't and the PCM is correct, then you might have a short in the signal wire to the solenoid.
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Old 06-29-2013, 11:37   #7 (permalink)
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Re: 1999 Navigator EGR issue, really unexplainable.

nope, new vacuum solenoid is not working. Problem solved.
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Old 06-29-2013, 18:41   #8 (permalink)
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Re: 1999 Navigator EGR issue, really unexplainable.

Good to hear!
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