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92 Civic - Hesitate/stutter/stall when warm & below 2500rpm
I bought this civic (abused) over 4 years ago. Its an LX 1.5L. We've
been thru a lot together including a motor, computer, clutch, rad, starter, etc. I've never taken it too a shop. So now this issue has me stumped. One cold -15 C morning it started up for 30 seconds and then stumbled until it died. I warmed it up in my garage and have since narrowed down the symptoms: Runs great until the engine is warm. As temp increases the problem developes. When hot and idling a quick twist of the throttle will cause it to die over a few seconds. RPMs will increase normally if you twist the throttle slowly. When on the road, I can excellerate slowly until 2500 rpm. After that I can punch the gas and rev to 5500 with no stumbling. Below 2500 under normal acceleration the engine cuts out until peddle is released and then it revives. I can make it happen by tapping the gas, but only below 2500 rpm. I pulled a plug wire and ground a spare plug to watch what happened when I caused a stall. Spark was great until the bitter end. I have a recent fuel filter, O2 sensor, coolent temp sensor, distributer assembly, and plugs. No engine light, but computer gave me Code 3 (MAP) and Code 43 (fuel delivery). I swapped MAPs with another Civic and no improvement. After reseting computer, I can't get it to throw those codes again. This problem is not intermittent. It is 100% predictable and was obviously triggered by a very cold night. I'm well into testing components. I've never checked vacuum and fuel pressure, but this may be the time to get the equipment. Hoping there is an obvious solution first. Any ideas or input would be great. |
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#2
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92 Civic - Hesitate/stutter/stall when warm & below 2500rpm
Try a thorough purge of the cooling system. Follow the
manual's directions. Note that during the purge procedure and in cold weather, it may take 30 minutes to an hour for the radiator fan to come on twice. Some engine control sensors will send the wrong signal, and cause odd revving, if not fully immersed in coolant. Your symptoms suggest this is the problem. But there are other possible causes. Also pour a bottle of Chevron Techron fuel system cleaner into a near empty fuel tank, refill, and run. > wrote >I bought this civic (abused) over 4 years ago. Its an LX >1.5L. We've > been thru a lot together including a motor, computer, > clutch, rad, > starter, etc. I've never taken it too a shop. > So now this issue has me stumped. One cold -15 C morning > it started > up for 30 seconds and then stumbled until it died. I > warmed it up in > my garage and have since narrowed down the symptoms: > Runs great until the engine is warm. As temp increases > the problem > developes. > When hot and idling a quick twist of the throttle will > cause it to die > over a few seconds. RPMs will increase normally if you > twist the > throttle slowly. > When on the road, I can excellerate slowly until 2500 rpm. > After that > I can punch the gas and rev to 5500 with no stumbling. > Below 2500 > under normal acceleration the engine cuts out until peddle > is released > and then it revives. I can make it happen by tapping the > gas, but > only below 2500 rpm. > I pulled a plug wire and ground a spare plug to watch what > happened > when I caused a stall. Spark was great until the bitter > end. > I have a recent fuel filter, O2 sensor, coolent temp > sensor, > distributer assembly, and plugs. > No engine light, but computer gave me Code 3 (MAP) and > Code 43 (fuel > delivery). I swapped MAPs with another Civic and no > improvement. > After reseting computer, I can't get it to throw those > codes again. > This problem is not intermittent. It is 100% predictable > and was > obviously triggered by a very cold night. > > I'm well into testing components. I've never checked > vacuum and fuel > pressure, but this may be the time to get the equipment. > Hoping there > is an obvious solution first. > Any ideas or input would be great. |
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92 Civic - Hesitate/stutter/stall when warm & below 2500rpm
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92 Civic - Hesitate/stutter/stall when warm & below 2500rpm
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92 Civic - Hesitate/stutter/stall when warm & below 2500rpm
I thought air in the cooling system affected idle more than anything.
My idle is fine. None the less, I will try purging the system. I had a spare distributer assembly (including cap & rotor) when I misdiagnosed the computer last year. The old one worked fine, and the new one is a year old. Swapping them has no affect. Did the plugs and wires also. It feels like the issue is not ignition related. What about fuel supply and mixture? What happens with a faulty fuel pressure regulator? Is it running rich or lean from idle to 2500 rpm? Since it's a quick twist of the throttle that stalls it, could it be TPS sensor? I think my fuel pump is OK since I can stomp the gas at 4000 rpm and it goes fine. I'll keep on it, but will be more productive this weekend. |
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92 Civic - Hesitate/stutter/stall when warm & below 2500rpm
On Jan 9, 3:14 pm, wrote:
> I bought this civic (abused) over 4 years ago. Its an LX 1.5L. We've > been thru a lot together including a motor, computer, clutch, rad, > starter, etc. I've never taken it too a shop. > So now this issue has me stumped. One cold -15 C morning it started > up for 30 seconds and then stumbled until it died. I warmed it up in > my garage and have since narrowed down the symptoms: > Runs great until the engine is warm. As temp increases the problem > developes. > When hot and idling a quick twist of the throttle will cause it to die > over a few seconds. RPMs will increase normally if you twist the > throttle slowly. > When on the road, I can excellerate slowly until 2500 rpm. After that > I can punch the gas and rev to 5500 with no stumbling. Below 2500 > under normal acceleration the engine cuts out until peddle is released > and then it revives. I can make it happen by tapping the gas, but > only below 2500 rpm. > I pulled a plug wire and ground a spare plug to watch what happened > when I caused a stall. Spark was great until the bitter end. > I have a recent fuel filter, O2 sensor, coolent temp sensor, > distributer assembly, and plugs. > No engine light, but computer gave me Code 3 (MAP) and Code 43 (fuel > delivery). I swapped MAPs with another Civic and no improvement. > After reseting computer, I can't get it to throw those codes again. > This problem is not intermittent. It is 100% predictable and was > obviously triggered by a very cold night. > > I'm well into testing components. I've never checked vacuum and fuel > pressure, but this may be the time to get the equipment. Hoping there > is an obvious solution first. > Any ideas or input would be great. i've never got a similar experience, but i suspect a too advanced ignition timing combined with a weak coil ( or weak ignition parts). i would re-check the distributor assembly and the ignition coil cheers |
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