Hello y'all,
My Spider is a joy to drive save for one driveability issue that is intermittend but rather annoying when it happens, a fairly bad part-throttle stumble. It does not appear until the car is good and warmed up (driven for 10-15 minutes or so), and is intermittent then. I haven't been able to correlate the event to anything yet. It feels (note 'feels' since I don't really know) like a momentary fuel cut that happens repeatedly, say 3-5 times within 5-10 seconds. It generally occurs at light throttle, but while it seems to correlate to manifold pressure it does not to boost / no boost - putting your foot in it to get to + MAP on acceleration will mostly eliminate it, but not entirely. It comes and goes sort of unpredictably.
After a long period of sitting, last year the car got the fuel tank cleaned out, new fuel pump and rubber lines, new plugs, and a few other things I can't recall. It has occurred to me that it could be an intermittent fuel supply problem caused by little bits from somewhere blocking the line. I suppose a fuel filter swap ought to give me a clue.
I won't have an opportunity to do any diagnosis on the car until at least early next week (more likely the following weekend), but I thought I'd at least ask. I've done some directed archive searching and haven't found anything that seems related. The only driveability issue the car had in past years was a dislike of cold idling that was caused by the AAR. Next week I'll have time to get the diagnostic manuals and take a look.
Actually, I suppose that isn't the only issue, as the car is intermittently a no-start when hot. It will occasionally die at idle when the idle drops a bit, and 2-3 times this fall it won't restart immediately. Cranks, fuel seems to be fine (I can hear what sound like the injector solenoids), but no start. Then it does.
David
Chicago
light throttle stumble (2L Turbo)
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otter
- Posts: 45
- Joined: Wed Oct 01, 2008 5:01 pm
- Your car is a: 1981 Turbo Spider
-
otter
- Posts: 45
- Joined: Wed Oct 01, 2008 5:01 pm
- Your car is a: 1981 Turbo Spider
Re: light throttle stumble (2L Turbo)
I realize this is a very old post of mine, but I since I noticed it now while searching for something else, I thought I'd provide an update.
This turned out to be a combination of a bad coil wire and the coolant overflow bottle causing a short. I figured this out one day a while ago when I swas driving it on I-94. The coil wire was routed in a way such that it passed right in front of or on top of (or something like that) the overflow bottle. When the car was good and warm, eventually coolant would spit out of the overflow bottle (the car needs a cooling system overhaul) directly onto the coil wire, which would then short out and cause the stumble. Fortunately, when I discovered this by the side of the road I *happened* to have a new coil wire in the trunk. Replace and reroute wire, problem solved!
David
This turned out to be a combination of a bad coil wire and the coolant overflow bottle causing a short. I figured this out one day a while ago when I swas driving it on I-94. The coil wire was routed in a way such that it passed right in front of or on top of (or something like that) the overflow bottle. When the car was good and warm, eventually coolant would spit out of the overflow bottle (the car needs a cooling system overhaul) directly onto the coil wire, which would then short out and cause the stumble. Fortunately, when I discovered this by the side of the road I *happened* to have a new coil wire in the trunk. Replace and reroute wire, problem solved!
David