Mack tool smart box brings up code P0507 idle speed high.
Things I tried: Replaced Throttle positioning sensor, cleaned idle sensoring unit, and replaced thermostat.
Some times the E.G.R. will stick half open. This will make the engine surge or have high idle. Try replaceing the E.G.R. located under the upper intake. Do not go with after market E.G.R. The spring in them are to powrefil and the E.G.R. wil not open. Also try replaceing the O2 sensors. This could give the engine more fuel thus a higher idle. Some vehicles the T.P.S. can be ajusted, do some checking to see if yours is adjustable.
Please contact me if your problem presists.
Thanks, Charlie
Check for a vacuum leak.
The egr valve can be checked manually by pressing the diaphram in with your fingers, just try moving it and listen for changes. I believe on that model that vavle should be accessible for that on top of the engine. O2 sensors should not be the problem in my opinion, they do not break easily and would trigger a trouble code if they did....
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Trouble Code: P0507
IDLE SPEED HIGH PERFORMANCE
Possible Causes:
GOOD TRIP EQUAL TO ZERO
PCV SYSTEM
IAC MOTOR PASSAGES
VACUUM LEAKS
AIR INDUCTION SYSTEM
THROTTLE BODY AND THROTTLE LINKAGE
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I have
Wasn't able to find vacuum leak earlier but will look again just to be sure. Will replace EGR next, then perhaps the o2 sensors. Both good suggestions, really appreciate it.
idle too high
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