van hunting at idle

bluebus86 · Banned Joined: September 02, 2010 Posts: 11075

Got a 1986 2.1 liter 2 wd Vanagon. when at idle, whe has started to hunt, the hunting of rpms is intermittant, sometimes she wont do it, but about half the time she hunts +/-100 rpm to maybe a maximum of +/- 200 rpm at idle.

I know the throttle switch is closing (i have the Vanagon ecu tester box conected, the light on it shows the throttle switch closed). The engine has some fairly recent new vacuum hoses and intake seals /boots.

Any one got some ideas on where to look for a fix?

thanks!

hdenter · Posted: Mon Oct 10, 2011 9:29 pm Post subject:

You are on the right track with going over all the new vacuum lines and connections. Also take a look at the idle control valve and it's hoses. See if you can isolate a common denominator at the times it happens. Is it only when the car is first started, Only while you are turning the steering wheel (if you have power steering) etc. Is this a new problem that has developed recently? Is the van new to you? You could try the WD40 spray trick, but it makes a mess.

Good Luck,

Hans
_________________
'79 triple white convertible bug
'84 sunroof vanagon
'85 weekender

captdave · Posted: Tue Oct 11, 2011 10:39 am Post subject:

Take a good look at all air hoses. It could be un-metered air. You could try passing a turned on, unlit propane torch around the area of the air hoses. If the engine speeds up that is probley your problem. Just be carful not to cause an explosion!!!

captdave · Posted: Tue Oct 11, 2011 10:40 am Post subject:

Take a good look at all air hoses. It could be un-metered air. You could try passing a turned on, unlit propane torch around the area of the air hoses. If the engine speeds up that is probley your problem. Just be carful not to cause an explosion!!!

Ahwahnee · Posted: Tue Oct 11, 2011 10:58 am Post subject:

I'll be interested in what you finally find that cures it.

You might try this -- next time it is hunting undo the oil filler tube cap and see if the hunting ceases (works on mine). If it stops the hunting then it may be telling you something -- but I don't know what.

seanjenn · Posted: Tue Oct 11, 2011 11:14 am Post subject:

If you don't have propane handy to help find the leak, use something like intake cleaner, starting fluid etc. that stuff is super flammable and will give you a change in idle for sure. Absolutely put a little red tube on the spray nozzle first and keep your extinguisher handy.
Could also have air leak where the "butterfly" shaft goes through the throttle body.
_________________
1987 GL Sunroof
2.1 4 spd

randywebb · Posted: Tue Oct 11, 2011 12:57 pm Post subject:

repl. O2 sensor solved this problem on mine
_________________
1986 2.1L Westy 2wd Auto Trans.

DAIZEE · Posted: Tue Oct 11, 2011 1:41 pm Post subject:

Some may not like this comment but Vanagons seem to be describable in many different ways: hunting, bucking, and many more titles in past threads. I just wondered if this one had a license Laughing

_________________
'09 2.5L Jetta 5 cylinder, 5 spd, super turbo, see thread in H2O Cooled Jetta, etc...
83.5 Vanagon L Riviera Model with 98 1.9L TD AAZ 4 speed Daily Driver 3 out of 4 seasons (sold)
84 Vanagon GL Wolfsburg Westy WBX 4 speed (sold)


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