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OBD1 software diagnosis assistance.
ahoogah - February 21st, 2010 at 12:15 PM

Hi Guys, I have installed an EJ22 into a T3 and after having fuel problems (sludgy fuel tank), the engine is running superbly.
It was said by a VW officianado that I will be disappointed with the conversion compared to the wasser boxer.
Well it doesn't sound like a VW engine nor pull like one, it is smooth, torquey and quiet and pushes the van along fast enough to warrant a careful eye on the speedo.
The idle revs on an EJ22 cannot be adjusted manualy and as it is idling excessively, I need the assistance of someone with OBD1
software capabilities.
I do intend to get the necessary software etc. but really need a quick fix. Any assistance would be greatly appreciated.:cool:
Thanks,Dave.

Joel - February 21st, 2010 at 07:12 PM

this is a pretty common problem in all ej series engines
idle speed is adjusted by loosening and rotating the Idle air control valve

99.9% of the time high or low idles are not a software issue
its the IACV is gummed upwith carbon

try cleaning it out first
and then set the idle with it

process is pretty simple


http://www.ozliberty.com/home/suspension-and-handling/idle-air-control-valve-...

ahoogah - February 21st, 2010 at 07:34 PM

Thanks Joel,I removed the battery to start another vehicle and on re installing and starting the idle has dropped to an acceptable
level. I am thinking that with the fuel problems I was having, the ECU may have adjusted to suit and when I disconnected the battery the ECU may have cleared. Appears all good now, but I will clean the valve.
Thanks for the link Joel.
Dave.

ElusiveStranger - February 24th, 2010 at 02:12 AM

Quote:
Originally posted by Joel

idle speed is adjusted by loosening and rotating the Idle air control valve


No it isn't. It's done by the ECU, basically treating the ICV as a stepper motor

Edit: Should have added, follow those cleaning instructions but add some "witness marks" onto the IACV body and the actual valve - then you'll be able to align it back up as to factory settings

Joel - February 24th, 2010 at 06:47 AM

damn you got me there bloke ;)

guess i shoulda added, you can tweak the speed if you have a IACV with slotted mounting holes, most do but some dont

ECU controls how much it opens but the valve itself is set at the factory,
usually they dont need moving, just cleaning

ElusiveStranger - February 24th, 2010 at 11:51 AM

Hehe. But seriously, loads of people think you adjust the IACV to alter tickover.

Above all, don't adjust it by using the throttle stop on the Throttle Body

ahoogah - February 25th, 2010 at 07:25 PM

Hey guys, I removed and cleaned the IACV as per the link and the problem seems resolved. I still have a slight flat spot on start off but that could be due to changed inlet dynamics.
Thanks again, Dave.

ElusiveStranger - March 1st, 2010 at 09:15 AM

Yay :starhit: