2000 4.2 hard start
Possible the IMRC (intake manifold runner control) is hung a bit causing the whistle and may help to set the fuel/lean codes. Low engine temp, rich mixture conditions. Most minor vacuum leaks tend to be noticed or develop at idle or just off idle. Again, if you can use a listening device and work around the engine to help point to the whistle origin, might help with a direction. An external vacuum leak should be reasonably easy to pick up.
If the scan tool they used has the capability to access the system PIDS ( parameter information display) they can look and see what the engine running temps are, or, what the PCM see's..
If the scan tool they used has the capability to access the system PIDS ( parameter information display) they can look and see what the engine running temps are, or, what the PCM see's..
Great information haya. Thanks for sharing this .!!
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Joined: May 2011
Posts: 717
From: Colorado, near Denver
One thing no one's mentioned is the PCV rubber elbow that is always and forever a problem on this engine. It sits directly on the very bottom of the intake and went into a nipple that came out of the intake manifold that is right behind the throttle body; it helps if you take the throttle body off, but I've done so many of these that I can do them in my sleep.
The IMRC wouldn't cause a global leak, since EEC is bitching about problems with both banks. Also, there was a large vaccuum connector on the rr of the intake (right next to where the EGR control valve is) that was a rich area for vacuum leaks due to hoses getting brittle and breaking.
Also, if the intake is ever off, remember to clean the EGR ports out to prevent misfires. This intake on this engine really appreciated that.
The IMRC wouldn't cause a global leak, since EEC is bitching about problems with both banks. Also, there was a large vaccuum connector on the rr of the intake (right next to where the EGR control valve is) that was a rich area for vacuum leaks due to hoses getting brittle and breaking.
Also, if the intake is ever off, remember to clean the EGR ports out to prevent misfires. This intake on this engine really appreciated that.
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Joined: Aug 2015
Posts: 15
UPDATE!..so after doing a bit more research not wanting to throw money at it, i determined the easiest and cheapest way to take an eduacated guess was to replace the CHT sensor and reset the pcm...
so i went to my local zone and with the rewards i had on my card i payed 6 bucks for the CHT reset pcm and installed the CHT AND BAM..no more check engine light, all my gauges now work(temp gauge) and my air bag light isnt flashing...purrs like a kitten now
so i went to my local zone and with the rewards i had on my card i payed 6 bucks for the CHT reset pcm and installed the CHT AND BAM..no more check engine light, all my gauges now work(temp gauge) and my air bag light isnt flashing...purrs like a kitten now
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