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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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May 16th, 2018, 12:22 | #31 |
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Dim dip resistor
Oh yes it is!
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May 16th, 2018, 12:26 | #32 |
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Just to slightly drag this back the problem OP started it with (I know, sorry - btw good to learn what all those resistors do in the bay so not complaining).
If you wanted to I will be in warminster this weekend so you could try my icv from a known working car to see if the symptoms change/disapear. PM me if you want to try it. PP |
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May 16th, 2018, 12:42 | #33 |
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While i remember it, pulling the vacuum hose off the FPR at idle and the engine speed increasing is a sure sign it's running too lean - almost certainly an air leak.
Like i said originally, check the hose between the MAF and throttle body for splits and security - also check the hose between the EICV and the inlet manifold for the same.
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May 16th, 2018, 13:39 | #34 |
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All air hoses are good no leaks & vac lines were all replaced not long ago. Heres one. the idle control valve is drawing 11.5 volts at the plug when i twist the throttle should that voltage drop ie when coming off idle cos mine stays the same no reaction from the tps to icv.
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May 16th, 2018, 14:04 | #35 | |
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Pp
Quote:
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May 16th, 2018, 14:28 | #36 | |
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Quote:
However that's for a 1995 model, not sure if they changed to a different idle control valve on later models. Was that reading taken with the engine running?
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May 16th, 2018, 14:44 | #37 |
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No just on po2 of ignition. I thought as you press the throttle the tps clicks telling the ecu to come off idle stopping voltage to the icv.
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May 16th, 2018, 15:02 | #38 | |
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Quote:
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May 16th, 2018, 15:33 | #39 |
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It is firing and supplying fuel, but you have not enough air or fuel.
Fuel pressure reg is a likely cause but pull the vac pipe off and check for fuel leakage or change in engine note. Check for air leaks, throttle body gummed up (clean with intake cleaner). |
May 16th, 2018, 15:34 | #40 | ||
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Quote:
The TPS tells the ECU when the throttle is either at idle position or at full throttle, it alters timing, fueling etc from these signals and possibly might switch the earth return to the ICV off when not idling. Quote:
Ash doesn't know what he's missing having never had to diagnose and fix a nasty dim-dip system!
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