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Volkswagen Vanagon: 1980-1991 (T3) 84 vanagon 1.9gw idle erratic and fuel pump not getting full voltage


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Last Post: Nov 8, 2012 5:33 PM Last Post By: chip53
chip53

Posts: 10
Registered: 11/02/12
84 vanagon 1.9gw idle erratic and fuel pump not getting full voltage
Posted: Nov 2, 2012 9:16 AM
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Hi just purchased my vanagon after it had been sitting for time, main ignition parts replaced ie leads plugs cap rotor arm and most connections cleaned including earths ... but the problem is with the idle which very slightly fluctuates between 800 and 1000 and never stays constant. I might add that as far as I can tell all the vacuum pipes have been sorted to. Also it has now stopped running, hard wiring the fuel pump has got it started as pump was receiving 0.5v. Any ideas?
FKH161

Posts: 7,661
Registered: 12/29/05
Re: 84 vanagon 1.9gw idle erratic and fuel pump not getting full voltage
Posted: Nov 4, 2012 5:53 PM   in response to: chip53 in response to: chip53
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Fuel pump relay working?
chip53

Posts: 10
Registered: 11/02/12
Re: 84 vanagon 1.9gw idle erratic and fuel pump not getting full voltage
Posted: Nov 6, 2012 2:22 AM   in response to: chip53 in response to: chip53
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thanks for the reply ... yes fuel relay clicks when ignition is on
TomB

Posts: 1,416
Registered: 08/06/02
Re: 84 vanagon 1.9gw idle erratic and fuel pump not getting full voltage
Posted: Nov 6, 2012 8:28 AM   in response to: chip53 in response to: chip53
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The relay contacts could still be burned and have high resistance. Best to measure voltage at the in and out of the relay as it functions.
chip53

Posts: 10
Registered: 11/02/12
Re: 84 vanagon 1.9gw idle erratic and fuel pump not getting full voltage
Posted: Nov 7, 2012 4:04 AM   in response to: chip53 in response to: chip53
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Ah ha! ... seems to work fully now after loose coonection behind air cleaner ... feeling stupid now. However now have hot strting issue as well as idle erratic. Replace ground to gearbox nose - no change, what it does do is lose power very quickly when trying to restart so going to try and bypass ignition wiring (cleaned all connections aready and alternator pumping out 14v at 1500rpm). Has anyone got any other ideas? cheers for the help
BUGGSY

Posts: 208
Registered: 11/04/06
Re: 84 vanagon 1.9gw idle erratic and fuel pump not getting full voltage
Posted: Nov 7, 2012 10:04 PM   in response to: chip53 in response to: chip53
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If your fuel pump is working properly, check the F/I temperature sensor. Reguarding the erattic idle, check the timing with a timing lite and set it exactly on the V cut into the crank pulley at idle. Sometimes too much advance is set and the ECU goes hunting looking for the correct setting.

Buggsy
chip53

Posts: 10
Registered: 11/02/12
Re: 84 vanagon 1.9gw idle erratic and fuel pump not getting full voltage
Posted: Nov 8, 2012 5:33 PM   in response to: chip53 in response to: chip53
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Thanks tom and buggsy ... looking into all that now ... will let you know what happens (fi temp sensor - I assume that is the temp2 under air con?)

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