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**HELP** 91 DOHC Starts then Dies/Stops Immediately
*** PLEASE HELP ***
CAR: 1991 DOHC, 187,000 miles, automatic PROBLEM: Car starts, then dies immediately. Will not run after starting. The start-up sounds normal, but then it just stops running. HISTORY: For the last two months, Car ran great at 70 mph on the highway. A few times while driving or backing at 5mph, car would die, but could then be restarted immediately. A couple of days ago, while slowing down for a turn, car stopped running. Car then began the problem: start and die immediately. It did it when the engine was HOT, and now does it when the engine is cold. CHECKED SO FAR: Plugs & wires all OK. Fuel pump "whirrs" for 2-3 seconds when key moved to the "on" position. Oil Pressure builds immediately to proper pressure on the short "start-up." Coilpaks and wiring looks OK. REPLACED SO FAR: Coolant Temp Sensor, Crankshaft Position Sensor. WHAT NEXT?: Please advise as to what else might be causing this problem. Anyone's advice on this is welcome. |
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"paul" > wrote in message om... > *** PLEASE HELP *** > > CAR: 1991 DOHC, 187,000 miles, automatic > > PROBLEM: Car starts, then dies immediately. Will not run after > starting. The start-up sounds normal, but then it just stops running. > > HISTORY: For the last two months, Car ran great at 70 mph on the > highway. A few times while driving or backing at 5mph, car would die, > but could then be restarted immediately. A couple of days ago, while > slowing down for a turn, car stopped running. Car then began the > problem: start and die immediately. It did it when the engine was > HOT, and now does it when the engine is cold. > > CHECKED SO FAR: Plugs & wires all OK. Fuel pump "whirrs" for 2-3 > seconds when key moved to the "on" position. Oil Pressure builds > immediately to proper pressure on the short "start-up." Coilpaks and > wiring looks OK. > > REPLACED SO FAR: Coolant Temp Sensor, Crankshaft Position Sensor. > > WHAT NEXT?: Please advise as to what else might be causing this > problem. Anyone's advice on this is welcome. How old is the fuel filter? Ken |
#3
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Napalm Heart wrote:
> > How old is the fuel filter? At the most basic level, three things are required for a gasoline engine: fuel, spark, and air. FWIW, fuel sounds like a highly likely suspect here. I would check (change) the filter first, and then perhaps move to the fuel pump. Even if you hear it whir, it may not be providing the proper pressure, or failing intermitently possibly due to age or as debris is (are?) pulled toward and blocking the pickup lines in the tank. Check and change your air filter. A blocked air intake will cause all sorts of fun problems as the PCM tries to figure out how to mix fuel with not enough air. -rj 98SL2 |
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"richard hornsby" > wrote in message ... > Napalm Heart wrote: > > > > How old is the fuel filter? > > At the most basic level, three things are required for a gasoline > engine: fuel, spark, and air. > > FWIW, fuel sounds like a highly likely suspect here. I would check > (change) the filter first, and then perhaps move to the fuel pump. Even > if you hear it whir, it may not be providing the proper pressure, or > failing intermitently possibly due to age or as debris is (are?) pulled > toward and blocking the pickup lines in the tank. > > Check and change your air filter. A blocked air intake will cause all > sorts of fun problems as the PCM tries to figure out how to mix fuel > with not enough air. > > -rj > 98SL2 Exactly. Even with the higher technology, often problems come down to a basic issue. A car my wife had would let us know when the fuel filter needed changing. The car wouldn't go over 35 mph, then it just wouldn't go. Ken |
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****** Took your advice and changed the fuel filter but the problem
still continues. Also, there are NO fault/diagnostic codes appearing to help further. Does anyone have another idea to try? Could it be the KEY ignition/lock switch? How would you test for that? I'm beginning to grasp at anything! THX everyone. ***** "Napalm Heart" > wrote in message >... > "richard hornsby" > wrote in message > ... > > Napalm Heart wrote: > > > > > > How old is the fuel filter? > > > > At the most basic level, three things are required for a gasoline > > engine: fuel, spark, and air. > > > > FWIW, fuel sounds like a highly likely suspect here. I would check > > (change) the filter first, and then perhaps move to the fuel pump. > Even > > if you hear it whir, it may not be providing the proper pressure, or > > failing intermitently possibly due to age or as debris is (are?) > pulled > > toward and blocking the pickup lines in the tank. > > > > Check and change your air filter. A blocked air intake will cause > all > > sorts of fun problems as the PCM tries to figure out how to mix fuel > > with not enough air. > > > > -rj > > 98SL2 > > Exactly. Even with the higher technology, often problems come down to > a basic issue. A car my wife had would let us know when the fuel > filter needed changing. The car wouldn't go over 35 mph, then it just > wouldn't go. > > Ken |
#6
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Here is a senerio...
When you turn the key on, the fuel pump will run about 5 seconds to prime the system. Once the engine is running, the PCM senses oil pressure then allows the fuel pump to run again. Maybe the system is primed when you turn the key on, which will allow the car to start, but not keep running because of an oil pressure or sensor problem. James |
#7
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In article >, james1549
@aol.com says... > Here is a senerio... > > When you turn the key on, the fuel pump will run about 5 seconds to prime the > system. Once the engine is running, the PCM senses oil pressure then allows the > fuel pump to run again. > > Maybe the system is primed when you turn the key on, which will allow the car > to start, but not keep running because of an oil pressure or sensor problem. > > James > Earlier post: > seconds when key moved to the "on" position. Oil Pressure builds > immediately to proper pressure on the short "start-up." Coilpaks The switch in the oil pressure sensor would have to be bad which isnt unlikely. Another senerio would be the fuel pumps shot and not making enough pressure. Buy a fuel pressure gage. Shouldnt cost more than 30 bucks and it is a good tool to have around. You should see about 40-44 psi when the key is cycled on and after the car is running or ran. |
#8
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Blah Blah > wrote in message >...
> In article >, james1549 > @aol.com says... > > Here is a senerio... > > > > When you turn the key on, the fuel pump will run about 5 seconds to prime the > > system. Once the engine is running, the PCM senses oil pressure then allows the > > fuel pump to run again. > > > > Maybe the system is primed when you turn the key on, which will allow the car > > to start, but not keep running because of an oil pressure or sensor problem. > > > > James > > > > Earlier post: > > > seconds when key moved to the "on" position. Oil Pressure builds > > immediately to proper pressure on the short "start-up." Coilpaks > > The switch in the oil pressure sensor would have to be bad which isnt > unlikely. > > Another senerio would be the fuel pumps shot and not making enough > pressure. Buy a fuel pressure gage. Shouldnt cost more than 30 bucks and > it is a good tool to have around. You should see about 40-44 psi when > the key is cycled on and after the car is running or ran. ================================================== ===================== 7/17/04 1530hrs - PAUL REPLIES: Bought the fuel pressure tester. Pressure is at 42 psi when pump whirrs. Little to no leak down/decay. With engine cranking, psi is 36. So, this does not appear to be the problem. Still no codes. WHat are the odds it is the knock-sensor ?? Btw, checked the wirinig for the oil pressure sensor, and it FEEDS nothing except the gauges. The oil pressure on saturns appear to be only for "show" warnings! They feed no computer! Thx for your help. |
#9
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