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post #1 of 3 (permalink) Old 06-20-2016, 03:22 PM Thread Starter
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Bucking 1987 Spider

I have a 1987 Spider Quad. Every once in awhile (such as today) the engine starts to die as I drive down the road. I pull off to the side and the engine continues to idle at 1000 RPM. When I step on the gas, I get no acceleration - just bumping up and down between 1000-2000 RPM. So, I cripple home staying off the main roads in 1st and 2nd gears. Suddenly, I get a pop/poof noise from under the hood and the car is running just fine again. The gas tank is a little over 1/2 full. I use only the highest octane gas that I can get (usually 91). The last time this happened, I poured a bottle of injector cleaner into the gas tank and it solved the problem. This time not. About 4 years ago I replaced the fuel pump in the fuel tank. That solved the bucking problem then.

Suggestions please?!
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post #2 of 3 (permalink) Old 06-20-2016, 04:22 PM
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Location: Mebane, NC
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I'd start by checking for 'false air'. Make sure all air entering the engine passes through the Air Flow Meter (AFM) and not via a cracked or loose hose. As the engine moves under torque reaction it can open a cracked air duct or loose hose. This 'false air' messes with the signal from the AFM to the computer and screws up the fuel injection. Then the engine will settle back and close off the false air and it tries again to accelerate opening up the crack again. The accordion shaped section of the main air duct is prone to splitting on the underside (hard to see).

- - Eric
don't read this
~ 1984 Spider Veloce ~
- -~ 1981 GTV-6 ~
Mebane, North Carolina


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- fuel injector cleaning
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post #3 of 3 (permalink) Old 08-13-2016, 11:26 AM Thread Starter
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Thanks Eric. It's been awhile since you offered this advice but I wanted you to know that I appreciate your help. I haven't looked at the BB for awhile but now I'm going to go out and check that accordion area.
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