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Date:         Sun, 8 Dec 2002 23:31:49 -0500
Reply-To:     Ronald D Maxseiner <THE_STINKSTER@PRODIGY.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Ronald D Maxseiner <THE_STINKSTER@PRODIGY.NET>
Subject:      High Idle, Fuel Pressure Test Results and Advice Needed
Content-Type: text/plain; charset="us-ascii"; format=flowed

I'm trying to solve a high idle problem on my 1985 GL before an emissions test in late January and I would appreciate any help. When cold the idle is a little high about 1000 RPM. It never really idles any lower than 1000 RPM. If it the idle was no higher than this I think I would be satisfied. As the van warms up the idle will increase to 1200 or 1400 rpm at idle for a few seconds then decrease again. When I come to a stop the engine returns to idle slowly halting around 1800 rpm for a few seconds then around 1400 for a few seconds then finally settling down to 1000 RPM. When the van is fully warmed up the idle will sometimes be very high, 1800 rpm, for a few minutes . This happens especially when I stop the van after it has fully warmed up and restart it in 10 minutes.

So far I have replaced/tested the following over the past few months. - plugs, wires, distributor cap and rotor - replaced small vacuum hoses to vacuum advance, fuel pressure regulator - measured manifold vacuum (around 10 - 12 psi ) - replaced O2 sensor - replaced temp II sensor

Replacing the above items has made the engine run much better but the idle problem has not really changed.

Here are the results of my test. Switch on ignition to pressurized fuel system. Initially it was 38 psi and after about 10 minutes the pressure was 34 psi. This seems to be in spec. At idle the fuel pressure was 34 psi. This seems to be high as the manual says 29 psi.

I'm planning to replace the fuel pressure regulator. Does this seem like a good step? High fuel pressure would seem to match most of my symptoms (all except the high idle when restarting hot).

Is it hard to replace the fuel line items? Can I use regular hose clamps or are there special clamps required? Any risk of cracking or breaking the 18 year old fuel lines?

Thanks in advance, Ron Maxseiner 1985 GL 'Stinky Pete'


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