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Car Forum / Volvo Cars / February 2008740 turbo just stops
My wifes 1988 740 turbo just stops I fiddled with the air mixture control cleaned it and the throttle body. Cleaned all most all electrics with dialectric grease .Opened connections and made sure they are tight but still it stalls when it wants to .It seems better for a while isf I thrash it a bit in the lower gears .But ulimately it returns to a rich mixture and dead .At least now it starts when its dead .It appears to happen when the car is slowing to a stop .The Volvo boys are stumped and so am I . >My wifes 1988 740 turbo just stops I fiddled with the air mixture control >cleaned it and the throttle body. Cleaned all most all electrics with [quoted text clipped - 3 lines] >and dead .At least now it starts when its dead .It appears to happen when >the car is slowing to a stop .The >Volvo boys are stumped and so am I . Unplug the air mass meter, does it start then? If that's ok, check the engine wiring harness, '88 is right on the threshold of when they changed to insulation that doesn't crumble. When I cut open the harness on my '87 I was amazed it ran as long as it did, there were bundles of literally bare wires, the insulation turned to dust and crumbled off and eventually ignition and injection wires were shorting together and causing random weird behavior and stalling until one day it just shut off and wouldn't start. HORRID THOUGHT BUT YES I WILL THANKS JAMES. I uplugged the air mass meter and it then rans so I cleaned the terminals on the lead and the meter .Its idling a bit fast but running well but tomorrow who knows ? >>My wifes 1988 740 turbo just stops I fiddled with the air mixture control >>cleaned it and the throttle body. Cleaned all most all electrics with [quoted text clipped - 14 lines] > together and causing random weird behavior and stalling until one day it > just shut off and wouldn't start. > HORRID THOUGHT BUT YES I WILL THANKS JAMES. I uplugged the air mass meter > and it then rans so I cleaned the terminals on the lead and the meter .Its > idling a bit fast but running well but tomorrow who knows ? That sounds like a bad air mass meter then, but it's worth checking the wiring as well. Fixing a rotten harness is not impossible, I did it on the street in front of my house while it was snowing, I was really wishing I'd done it in the summer when I noticed it was starting to crumble. Just now its running well reset micro switch on throttle body cleaned air mass meter contacts and fiddled tuning as wel, as base idle which was too high . Two days its running well are but tomorrow ?Its running very sweet actually smooth and reactive . > HORRID THOUGHT BUT YES I WILL THANKS JAMES. I uplugged the air mass meter > and it then rans so I cleaned the terminals on the lead and the meter .Its [quoted text clipped - 18 lines] >> shorting together and causing random weird behavior and stalling until >> one day it just shut off and wouldn't start. > Just now its running well reset micro switch on throttle body cleaned air > mass meter contacts and fiddled tuning as wel, as base idle which was too > high . > Two days its running well are but tomorrow ?Its running very sweet > actually smooth and reactive . Do inspect the wiring harness though, when mine was failing that's how it was, it would act up one day, then I'd fiddle with something and it would run like new for a few months, then act up again, then it started having issues more often until one day it just stalled and wouldn't start. My wifes 740 Turbo is running well it was adjustment of the micro switch on the throttle body resetting the base idle and altering the mixture which now is running neither rich or lean .Cleaning up various contacts such as on the Air mass meter and other switches and contacts helped .The electronic idle control contacts and internals as well .The throttle body is just a normal proceedure every so often .She drove many klm on sunday with no issues so its now 4 days no hiccups .Oh the wiring is interesting in places as well so that is now more secure ,thanks James . >> Just now its running well reset micro switch on throttle body cleaned air >> mass meter contacts and fiddled tuning as wel, as base idle which was too [quoted text clipped - 6 lines] > run like new for a few months, then act up again, then it started having > issues more often until one day it just stalled and wouldn't start. |
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