[20v] Intermittant misfire
b.benz at charter.net
Sun Feb 22 07:45:54 PST 2009
Tighten the TB and retime the dist. TB must be very tight. Ask if you
need retiming procedure.
On Feb 22, 2009, at 7:34 AM, B Vibert wrote:
> Hi Folks
> I'm trying to get a 1990 90q20v e-tested and it had horrible
> numbers. Starts and runs ok, but it has an intermittent misfire
> which is obviously pumping unburnt fuel out the tailpipe. When
> sitting at idle, or even revving, you can hear it misfire
> erratically, perhaps once or twice a second at idle. I've checked
> the codes, it had a knock sensor fault so I pulled the known good
> knock sensor off my parts car (engine runs great on it, the rest of
> it is too far gone) and got rid of that. Changed the plugs, (#2
> looked kind of sooty), then changed the wires and distributor cap
> and rotor. Still misfiring.
> Now I'm wondering where to go next. The distributor has a rattle
> at low speed, could that cause it? I'm a bit wary of pulling
> distributors and possibly breaking the fragile gear. Coil? Check
> compression and see if #2 does have a problem?
> Gonna go tackle it once I get some more coffee in me, just looking
> for suggestions.
> Burl Vibert
> 1990 90q20v x2
> Kingston, Ontario
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> 20v at lists.20v.org
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