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ai 400 surging

1234sj

By 1234sj
in Engine and Transmission

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1234sj Newbie

1234sj

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Hi there i am working on a 2003 ai 400 the engine is surging at idle and most noticeble from 800 to 1800 rpm.

we replaced all filters checked for air in the fuel(there was none).Fuel presure was76psi. replaced the injectors still didn't fix the problem.

The truck has bin to the mack dealership they tryed doing a cylinder cut out test but werent able to get any of the eups to respond.any one have any suggestions

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