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Date:         Tue, 2 Sep 1997 03:29:13 UT
Reply-To:     Dennis Haynes <dhaynes57@CLASSIC.MSN.COM>
Sender:       Vanagon mailing list <Vanagon@Gerry.SDSC.EDU>
From:         Dennis Haynes <dhaynes57@CLASSIC.MSN.COM>
Subject:      Re: Mustn't it be the ECU?
Comments: To: Erik Rhodes <ErikRhodes@PLATSOFT.COM>,
          Erik Rhodes <ErikRhodes@PLATSOFT.COM>

Make sure the auxiliary air regulator is getting power and look for bad grounds in the FI harness. When these ECU go bad, you'll know it. ECU caused poor running is usually caused by it getting poor information.

Dennis

-----Original Message----- From: Vanagon mailing list On Behalf Of Erik Rhodes Sent: Thursday, August 28, 1997 10:59 AM To: Vanagon@GERRY.SDSC.EDU Subject: Mustn't it be the ECU?

I've posted this problem before and got a bunch of great suggestions on what to look for. I've tried just about all of them now and the problem remains, I can't think what could be left but the ECU:

My '79 Westie starts up fine but as soon as the aux air regulator shuts off, I'm running too rich, engine's running rough. But if I drive it within a few minutes it runs pretty much fine and normal, the problem goes away. On an average southern California 75 degree day, it goes fine for about 20 minutes--less on a hot day--then the RMPs are too high when I stop at a light, the idle is way too high, around 1300RPM and gets worse the hotter the engine, maybe 1400RPM at worst.

Suggestions from list were to replace the hoses for a vacuum leak, which I did, no change unfortunately. The aux air regulator is new, the head temp sensor I've replaced, these gave me more pickup for sure and it runs better, but this problem remains. The oxygen sensor is new, replaced when I got it smoged, so it shouldn't be the problem. BUT, the other day after it was warmed up and idling too high I disconnected the oxygen sensor--viola, the idle went down to normal.

Could this be anything but the ECU not properly dealing with the signal from the oxygen sensor? Everyone says don't suspect the ECU until you've tried absolutely everything else, I can't guess what else it could be. HELP!


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