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Date:         Thu, 7 Dec 1995 10:02:21 -0500
Sender:       Vanagon Mailing List <vanagon@vanagon.com>
From:         "Morris H. Arthur" <marthur@gibbs.oit.unc.edu>
Subject:      Random coughing during acceleration/cruising (2.0l FI)

OK, I've avoided this problem for two years because of the diagnosis difficulties, but now it's occurring more regularly.

During acceleration and/or during cruising speeds, I sometimes get a momentary cough, where the whole engine seems to shut down: like either a momentary lack of power to the fuel injection system or a sudden blockage of fuel flow. The whole bus shudders and shakes for one/two seconds and then resumes normal (smooth) operation.

This is a tough one to debug because the problem never occurs during idle or engine revving and only randomly on the road...

I've already done full tune-ups and replaced the fuel and air filters.

I'm going to check: 1) Foreign matter in the fuel tank 2) Fuel pressure. 3) Systematic check of FI components.

My plugs are black--but not gunky or oily--could I be running too rich at times to cause random coughing ???

Other suggestions ?

--------------------------------------------------------- Morris Arthur < morris_arthur@unc.edu > Environmental Sciences and Engineering University of North Carolina


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