Diesel Bombers - rough idle when warm....... help

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fmx23

06-01-2013 03:46 PM

rough idle when warm....... help

Got two codes for a lift pump which has been replaced and a crank sensor which has not Been replaced. When the truck is warm and in park it idles somewhat rough like it has a small.misfire. but when you press the brake to put a load on the engine it idled fine. Can the cps cause a small misfire/bad idle??

lauber_03

06-03-2013 05:25 PM

yes it can cause a rough idle. i had a similar issue. replaced the cps which is kinda annoying to do being behind the vp but fixed the problem

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