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engine hesitation 1985 1.9 liter
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floggingmolly
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Location: San Diego, CA
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PostPosted: Sun Dec 13, 2015 12:01 pm    Post subject: engine hesitation 1985 1.9 liter Reply with quote

Hey guys, it looks like my 85 has somehow contracted vanagon syndrome from one of you 86-91s. Smile On accelerating, I notice a split second hesitation that has no consistent pattern, and it doesn't happen long enough to even do anything about it, only a couple times has it lasted more than a quarter second. Seems electrical to me since it's random and doesn't last long. My mechanic replaced the distributor and rotor (he had replaced the distributor fiber washers due to a non-starting issue a couple weeks back), check the fuel pressure (good), checked the CO and fuel mixture, adjusted the timing. I have had trouble starting it before I gave it to him to check the hesitation issue but managed to get it going sometimes by pressing the gas pedal, or once I was able to jump start it.

Could it be the ignition switch? AFM? Fuel pump relay? Temp sensor? Spark plugs are new, wires are good, fuel pump is just a few years old, alternator is a year old, I just replaced the main wire from the alternator to the starter with the GoWesty kit. Oxygen sensor is about 2 years old, the catalytic converter is 4 years old. I'm just not sure where to look.

Thanks in advance for any thoughts.
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rubbachicken
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PostPosted: Sun Dec 13, 2015 12:51 pm    Post subject: Re: engine hesitation 1985 1.9 liter Reply with quote

check the connectors in the fuel injector plugs, i've seen similar issues on another 1.9, after many hours chasing around, it was a bad joint in one of the injector plugs
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floggingmolly
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Joined: April 06, 2007
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Location: San Diego, CA
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PostPosted: Sun Dec 13, 2015 7:27 pm    Post subject: Re: engine hesitation 1985 1.9 liter Reply with quote

So I pulled the injector plugs (one may have been slightly loose on the forward passenger side) and cleaned them and added some dilectric grease. I also checked the spark plugs and the rear passenger may have been a bit loose, not sure. But while on that side I saw the large hose that goes up to the S-Boot was completely disconnected from its port on the engine(?).

Image may have been reduced in size. Click image to view fullscreen.


Just noticed a frayed wire in that photo, I better have a look see at that too!

I reconnected that hose (it may have shaken loose on some washboard road I've been having to drive on) and now it seems all good. I may have dislodged it when I replaced the spark plugs a month or so ago. They is now a hose clamp on it. Rolling Eyes Not sure if it was the injector plug that seemed loose, that would explain the erratic nature, but that disconnected hose was not good and I appreciate your advice that at least led me to that hose, and ultimately to what seems like the fix! Cheers Mark.
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