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Fuel Injected Rabbit Slow Start When Hot
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KoMbI19
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Joined: November 15, 2013
Posts: 148
Location: Cincinnati, Ohio
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PostPosted: Fri Sep 21, 2018 6:13 am    Post subject: Fuel Injected Rabbit Slow Start When Hot Reply with quote

Hey All,

Just bought my first antique FI VW last month, and its been a blast. 1982 Rabbit convertible with 38k on it, nearly mint condition. Runs like a top on the road with a little bit of a rough/low idle that jumps up and down from 800 to 600 RPM every few seconds. Never stalls out, just fluctuates.

Though lately after sitting after a drive anything over an hour I've noticed it cranking longer and longer before catching and firing. Last night it cranked for at least a minute (on and off), foot fully off or fully on the gas, no start, hardly any firing. New cap, rotor, plugs, and leads. I also swapped out the nasty oil soaked air filter and ran fuel system cleaner through it. I'm about to swap out the ignition coil for a higher rated one, and then the fuel filter. That's my next step. Any tips for diagnosing the FI system to rule that out or make adjustments?


Thanks!

-jd
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TDCTDI
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Joined: August 31, 2013
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Location: North Carolina
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PostPosted: Fri Sep 21, 2018 6:49 am    Post subject: Re: Fuel Injected Rabbit Slow Start When Hot Reply with quote

Probably a vacuum leak. Check intake boots at fuel distributor & throttle body, then for any of the small hoses, listen for hissing sounds. If none can easily be found, you might want to have a smoke test done to see where they're at.
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Butcher
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PostPosted: Fri Sep 21, 2018 7:24 am    Post subject: Re: Fuel Injected Rabbit Slow Start When Hot Reply with quote

I too recommend a smoke test. You'll probably have to pay for that test. I would ask the mechanic to be present when it is done. That way you can see for yourself what needs to be fixed.

Fuel pressure tests should be done too. If you do not know how CIS works, you might as well start reading up.
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KoMbI19
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PostPosted: Fri Sep 21, 2018 7:35 am    Post subject: Re: Fuel Injected Rabbit Slow Start When Hot Reply with quote

My old shop has a smoke test machine, I'll hook it up this weekend and test it. Hadn't considered that.
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1972 Karmann Ghia Coupe- all stock
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ps2375
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PostPosted: Fri Sep 21, 2018 11:01 am    Post subject: Re: Fuel Injected Rabbit Slow Start When Hot Reply with quote

Sounds like the WUR is getting old. It is that thing mounted to the front of the block next to the oil filter flange. They do have remans available (or they used to be, but very expensive). That item was the main reason I converted my last Rabbit to MegaSquirt. Never had a hot start issue again.
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