Volvo :: 1994 - Rough Idle When Cold / Have To Pump Gas Pedal To Keep It Going
I have a 1994 Volvo 940 and have previously owned a 740 for many years. I've only owned this car for about 1 month. The car appears to have been well cared for. Doesn't leak a drop of any fluids, everything works, and mostly a really nice old car. What happens is that it idles rough when it's cold. In fact, I have to pump the gas pedal to keep it going. When I first start off, the performance is less than what it should be too. Once it get warm, it mostly runs fine.
I have so far replaced, the Plugs, Wires, Cap & Rotor. All the vacuum lines, crank position sensor, Air Mass Meter and the fuel filter and most all the fuel lines too. The Fuel Pump Relay was replaced but I removed it and saw a few cold solders and fixed those but no changes in performance. Before I replaced the Air Mass Meter I brought it to local shop and they returned a readout of 2-3-2 which I'm understanding means running too lean. That's why I replaced the Air Mass Meter. (I did notice a big improvement once I replaced the Air Mass Meter too.) It was interesting that when I replaced the Distributor Cap, I noticed like black carbon in there and I'm not sure what could cause that. Although, I did find the previous plugs were not all the same. Three of them were high spark performance plugs and one was just normal
I pulled the Idle Air Control Valve and plugged one side to ground and the other side to 12V and noticed the flapper moving when powered on/off. The previous owner told me he replaced both fuel pumps about two years ago. It also looks like the fuel regulator valve is mostly new.
I'm guessing now that I have a problem with the Idle Air Control Valve or perhaps the Fuel Temp Sensor under the intake manifold. I purchased the Fuel Temp Sensor and just have not installed it yet. I really don't want to remove the intake manifold but I know it's not going to be that bad. I know that it could be carbon build up on the intake valves but I'm not quite convinced yet. I put some fuel cleaner in the tank to see if that works and so far nothing yet. The car only has 150K on it and I was told that during the owner before me did do highway driving.
When it's warm, the car does run very very well. The idle is still a bit quirky even when warm. For instance, when I power on the A/C, the idle RPM doesn't increase like I expect that it should. (It did on my 740) ... I'm still thinking maybe it's the Idle Air Control Valve too. Perhaps it's intermittent or do I understand that they can gradually open and gradually close?
Volvo :: 940 / 1994 - Engine Shuts Off While Driving?
Volvo 940 1994 engine shuts off while driving?
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I have a 1996 volvo 850 when ever its cold outside my engine doesnt wanna start. when it cranks it doesnt stay going it idles down then stalls. What to look for or why its doing this?
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View 7 RepliesVolvo - 240 :: Engine Idles High For 3 To 5 Seconds And Then Immediately Dies On Cold Start
A minor but persistent (year-long) rough idle on my 1991 240 has quickly turned into a Cold Start Nightmare over the past month:
SITTING HOURS OVERNIGHT (50 to 60-degree temp. overnight) - When I attempt to start in the morning, the engine idles high for 3-5 seconds and then immediately dies. To successfully start, I must keep pressing the accelerator pedal at least half-way down for 2-3 minutes. The engine sputters, almost backfires, shakes, lopes, almost dies, etc. After 2-3 minutes, everything runs just fine.
WARM ENGINE SITTING - Once the engine is warmed up, it will consistently start without problems. Still a slightly rough idle, but OK. The car does not die.
I have changed the battery, coolant temp. sensor, and spark plug wires.
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What's odd is that if i set the knob to the middle (pointing up), the rear lights come on, dashboard lighting works, and front-side lights come on as usual. In order to drive at night, I have to set the knob to the middle, and hold down the brights (which work fine).
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I've tried replacing the fuel relay and noise suppression relay. I always just guessed it was the noise suppression relay because it is located right next to the engine, and I just thought the soldering would melt when it gets too hot, then come back together after cooling. But, maybe this is totally off. I also replaced the mass air flow sensor before, but it had slightly different symptoms, and those have not come back. My problem now only happens on longer drives in the summer.
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The past summer my 1994 Volvo 940 non-turbo over heated and we worked on the coolant system and got it working god again. However just after we fixed it the headlights blew out and we replaced them and then they blew out again. The battery was also going dead when the car was turned off and all electric things were turned off. Now the head lights don't blow but once they are turned on with the switch in the car they cant be turned off unless the battery is disconnected.
Also as of now none of the dash board instruments are working. With the car on and the lights turned on we pulled the connector to the switch that turns on the lights, that is on the dashboard, and the lights still stayed on. We can only think that some water may be causing the problem but it may or may not. I need to know how to fix the headlight problem and the instrument panel.
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My '94 Volvo Sedan just loses power, no dash lights come on, it just silently dies. It starts right back up. I took it to a mechanic who checked out the fuel pumps (he said there were 2) and they tested fine. He replaced the fuel filter. It is still dying. It seems to happen when it is hotter, mornings are fine. It hasn't happened in the last few days because the temp has been about 82 tops. I read earlier today on this site that it could be the ignition module. I have replaced the air filter, and am running fuel injector cleaner also.
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