where did my 3k cold-startup go?
02-18-05, 12:32 AM
#1
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where did my 3k cold-startup go?
Hello,
My 91 convertible used to do the rev to 3k on a cold startup, but now it doesn't. Is this a sign of something or anything to be worried about? (P.S. I start the car in neutral)
Thanks,
Jesse
My 91 convertible used to do the rev to 3k on a cold startup, but now it doesn't. Is this a sign of something or anything to be worried about? (P.S. I start the car in neutral)
Thanks,
Jesse
02-18-05, 09:38 AM
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If you start the engine with the clutch pedal pushed in the cold start up procedure won't happen. This also takes some load off your starter motor and so everyone is happy.
02-18-05, 09:39 AM
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Like the above post said, at low water temps, it is not supposed to work.
If you look in the online series five manual, you'll see that the clutch switch and the neutral switch are involved along with the water thermo switch, full range tps circuit. You might suspect the neutral switch first. If the water thermo switch was bad you'd get a code and you are not getting that or you would have said something.
On a series four car, you have a water temp switch at the bottom of the radiator that controls the high idle at startup. If the water temp is below 62.6 F, the high idle speed won't happen until the water temp gets above that figure.
If you look in the online series five manual, you'll see that the clutch switch and the neutral switch are involved along with the water thermo switch, full range tps circuit. You might suspect the neutral switch first. If the water thermo switch was bad you'd get a code and you are not getting that or you would have said something.
On a series four car, you have a water temp switch at the bottom of the radiator that controls the high idle at startup. If the water temp is below 62.6 F, the high idle speed won't happen until the water temp gets above that figure.
02-18-05, 10:04 AM
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How important is that water temp sensor at the bottom of the radiator? My 3k start hasn't worked regularly since I got the vehicle, and a couple o fmonths ago I noticed the wires were frayed, and now one of the bullets snapped off at some time.
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02-18-05, 10:41 AM
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Don't worry about it not revving to 3k on start-up. That's just to heat the cats up quickly to keep emissions down at start-up. It's always seemed foolish to me to rev an engine that fast on start-up, because the oil has drained out of the filter (upside-down filters on these cars, and no anti-drainback valve in them) since the car was last shut off, so it takes a few seconds for oil to get properly distributed throughout the engine.
02-18-05, 11:20 AM
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Originally Posted by uRizen
How important is that water temp sensor at the bottom of the radiator? My 3k start hasn't worked regularly since I got the vehicle, and a couple o fmonths ago I noticed the wires were frayed, and now one of the bullets snapped off at some time.
That water temp switch at the bottom of the series four radiator does more than the three grand startup. It effects the Relief Solenoids operation also. If the wires are broken or the switch itself is defective internally, (not likely) the relief solenoid will not be energized when it should be and that will effect emissions which are important if your trying to pass emissions.
A quick soulution is to just couple the two wires/bullets together to simulate a warm/hot water situation. One of those wires is a ground. The other to the ECU. The ECU is looking for a ground thru the switch when the switch makes. Tie them together and you've done that.
The above is in the free, online, fsm for the series four.
02-18-05, 01:46 PM
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Originally Posted by HAILERS
That water temp switch at the bottom of the series four radiator does more than the three grand startup. It effects the Relief Solenoids operation also. If the wires are broken or the switch itself is defective internally, (not likely) the relief solenoid will not be energized when it should be and that will effect emissions which are important if your trying to pass emissions.
A quick soulution is to just couple the two wires/bullets together to simulate a warm/hot water situation. One of those wires is a ground. The other to the ECU. The ECU is looking for a ground thru the switch when the switch makes. Tie them together and you've done that.
The above is in the free, online, fsm for the series four.
A quick soulution is to just couple the two wires/bullets together to simulate a warm/hot water situation. One of those wires is a ground. The other to the ECU. The ECU is looking for a ground thru the switch when the switch makes. Tie them together and you've done that.
The above is in the free, online, fsm for the series four.
