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Stalling at Idle after warmed up issue.
Topic Started: Sep 22 2011, 10:59 PM (439 Views)
tecknovore
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I have a '90 XFI that recently started dying as I come to a stop when the car is fully warmed up. Idles normal when cold. This leads me to believe it is a closed loop problem. I have EGR deleted for a while so that isn't it. Changed PCV and cleaned tube. Have port on TB from evap can capped already. Have full 5 volts and almost no voltage drop to ground on all major sensors. Newer NGK iridium plugs, wires, cap, and rotor. Backprobed MAP and seems to be within spec at idle.(Though blowing through the little filter has some resistance). TPS seems to operate in spec. MAT seems in spec. Most vaccum lines have either been replaced within the last year, or eliminated and capped at the TB. Disconnected and capped ISC temporarily, but that didn't solve it. Newer Bosch O2 sensor, tapped and soldered wire inline and ran into cabin to monitor O2 (will use for future A/F gauge) and was getting around 800 mv cruising deep in the throttle but reading would go down to near nothing and jump around upon releasing throttle and deceleration.

I haven't gotten into checking compression, timing, vaccuum leaks at manifold yet, because of the symptoms only appearing after warmed up. Any ideas?

P.S. I read that Bryan's Geo thread, all 42 pages, I don't think I've had that much car drama in my whole life, and I've always been driving 15+ year old cars.

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allmountain40
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Check your compression and timing. Either of these is more likely a cause of a warm engine dying than an electronic issue.
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