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Go Back   Hummer Forums by Elcova > Hummer H2 Discussion Forums > Technical Discussion and Customizing your H2

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Old 04-09-2007, 02:58 AM
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Default Is the H2 equiped with a Egr valve?

I understand that the H2 has no Pcv valve, Does it however have a egr valve?.
Trying to resolve a stumble at idle on my 03 H2 for quite some time.
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Old 04-09-2007, 03:35 PM
Planohummer Planohummer is offline
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Default Re: Is the H2 equiped with a Egr valve?

no EGR valve.
Check throttle plate for carbon build-up. Have also seen water in fuel rail, stuck O2 sensor, or clogged exhaust causing this. Does the idle seem to dip then 'hunt' for baseline when you first put it in gear or does it just seem 'lopey' at all times?
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Old 04-10-2007, 01:21 AM
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Default Re: Is the H2 equiped with a Egr valve?

I have had this problem for over a year, tried flushing injectors at dealer, cleaned throttle body sev times, and Maf. New plugs and wires, i add fuel cleaner quite often. would any of the items you listed initiate a code? i have no engine light ever come up, only had a engine code for misfires when cat was plugged which has be fixed.
And yes the truck is 'lopey', seems almost like timing is off, as a matter of fact the engine pings and is very nticable between 1500/200 rpm, unless i have some other serious mechanical issue i don't think it is piston slap?.

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