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82 air cooled FI running very rich
voltz - January 5th, 2006 at 10:03 AM

my 82 air cooled fuel injected kombi (vanagon) is running extremely rich ( this happened suddenly).have run the vehicle on diagnostic test equipment and injector pulse width (at fast idle) is 5.6-5.8 milliseconds and the hertz rate is 20.I have not had much experience with VW and as far as Im aware only the temp sensor and the airflow meter are the inputs the computer uses to adjust fuel amount (please correct me if wrong).
I do not have the specs of factory diagnostic tests for testing the air flow meter,I have checked the temp sensor and it seems fine.
does anyone have or can tell me how to test the air flow sensor
Regards
Geoff

Bizarre - January 5th, 2006 at 10:59 AM

Geoff

I dont have a scanner here at the moment - i will be back at work on Monday

I have the "Official Factory Repair Manual"

I can scan the Fuel injection section and email it to you next week if you like??

it is about 16 pages.
u2u your email to me if you like - other wise photo copy and post??

Seems to cover the things you need to check

Barry


[ Edited on 5-1-2006 by Bizarre ]

Chewy - January 5th, 2006 at 12:11 PM

I have the bosch L Jetronic manual in PDF form, not sure if that is the same system the vangon used.
Can send it to you Via email, u2u me.
Cheers

Kombi_Rescue - January 5th, 2006 at 01:59 PM

suggest to change cyl temp sensor and do a pressure test as the fuel reg sometimes poo them selves....temp sensor is located at no 3 cylinder cheers steve

voltz - January 7th, 2006 at 07:41 AM

Im getting the bus towed home today (it was in a workshop I was partners in but due to poor cash flow I have had to move on and cant let it sit there,I now work for the Toyota dealership).......anyway the update is the old gir now doent want to start, I have confirmed compression is ok,and fuel pump now runs anytime the ignition is on pointing towards trouble with the dual relay,spar output from the coil also appears weak so its all kinda confusing at the moment

voltz - January 22nd, 2006 at 07:28 AM

Thanks heaps for the tech info supplied :)

Finally got around to some testing.
I have no injection pulse and have voltage (checked with test light only) on both terminals of the injector connector.
Im reasonably confident that the ECU is at fault,just wondering if Ive overlooked anything

Regards
Geoff

(ps....seems like I will be needing a good ECU for this,any known of for sale would be great)

Kombi_Rescue - January 23rd, 2006 at 07:23 AM

change the points and check if there is a voltage drop at the dissy as a worn starter can cause a power rob as the points activate the injector pulse...u can by pass the double relay ...rare to change a ecu in a aircooled t3...but you may be on the right track ...also a shot of fire extingisher on the ecu to help freeeze back any faulty solder joints.....check air flow meter flap to be sure its not twisteed and jammed open..hope some of these tips help you find the prob cheers steve