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#1
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lots o crankin before starting
I've got a 99 XLT with 4.0L SOHC engine with 137K miles. For quite some
time now it takes several seconds or more of cranking before the engine starts. When it does starts it sometimes stumbles until I press the gas pedal once or twice. After that it idles and runs fine. The cranking is fast, not slow like with a battery that's going bad. It doesn't seem to matter whether the engine hot or cold (at least as cold as it can get here in Phoenix). Since the problem started I've replaced the battery (which WAS going bad) and the plugs and wires. No change. Any suggestions on where to look next? |
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#2
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lots o crankin before starting
"Jerry" > wrote in message ... > I've got a 99 XLT with 4.0L SOHC engine with 137K miles. For quite some > time now it takes several seconds or more of cranking before the engine > starts. When it does starts it sometimes stumbles until I press the gas > pedal once or twice. After that it idles and runs fine. The cranking is > fast, not slow like with a battery that's going bad. It doesn't seem to > matter whether the engine hot or cold (at least as cold as it can get here > in Phoenix). > > Since the problem started I've replaced the battery (which WAS going bad) > and the plugs and wires. No change. Any suggestions on where to look > next? Hi Jerry, take a look at this link and see if your IAC could be your problem. Steve http://www.ford-trucks.com/article/i...r_IAC_Fix.html |
#3
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lots o crankin before starting
Esteban wrote:
> "Jerry" > wrote in message > ... >> I've got a 99 XLT with 4.0L SOHC engine with 137K miles. For quite some >> time now it takes several seconds or more of cranking before the engine >> starts. When it does starts it sometimes stumbles until I press the gas >> pedal once or twice. After that it idles and runs fine. The cranking is >> fast, not slow like with a battery that's going bad. It doesn't seem to >> matter whether the engine hot or cold (at least as cold as it can get here >> in Phoenix). >> >> Since the problem started I've replaced the battery (which WAS going bad) >> and the plugs and wires. No change. Any suggestions on where to look >> next? > > Hi Jerry, take a look at this link and see if your IAC could be your > problem. > Steve > > http://www.ford-trucks.com/article/i...r_IAC_Fix.html Thanks for the pointer. It doesn't really describe my problem, though. Mine always starts. Sometimes it idles fine immediately and sometimes it's rough until I press the gas pedal once or twice. After that it idles and runs fine until the next start. |
#4
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lots o crankin before starting
It sounds to me like you have a leak in your fuel system or bad check
valve in the fuel pump. Try this: Before you actually engage the starter, switch the truck from off to run about 5 times, pausing at run for a couple of seconds each time. If the truck then starts fine, most likely you have a fuel system problem - I'd bet on the check valve in the fuel pump. If you get a lot of black smoke when the vehicle first starts, then I'd guess you have a leaky injector. A mechanic with a fuel pressure gauge can diagnosis this problem in two minutes. Ed "Jerry" > wrote in message ... > I've got a 99 XLT with 4.0L SOHC engine with 137K miles. For quite > some time now it takes several seconds or more of cranking before > the engine starts. When it does starts it sometimes stumbles until I > press the gas pedal once or twice. After that it idles and runs > fine. The cranking is fast, not slow like with a battery that's > going bad. It doesn't seem to matter whether the engine hot or cold > (at least as cold as it can get here in Phoenix). > > Since the problem started I've replaced the battery (which WAS going > bad) and the plugs and wires. No change. Any suggestions on where > to look next? |
#5
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lots o crankin before starting
I think you hit it. I followed your on/off/on/off... procedure and it
started right up, no visible smoke. So it sounds like the check valve. How hard is it to change and where is it located? C. E. White wrote: > It sounds to me like you have a leak in your fuel system or bad check > valve in the fuel pump. Try this: > > Before you actually engage the starter, switch the truck from off to > run about 5 times, pausing at run for a couple of seconds each time. > If the truck then starts fine, most likely you have a fuel system > problem - I'd bet on the check valve in the fuel pump. If you get a > lot of black smoke when the vehicle first starts, then I'd guess you > have a leaky injector. A mechanic with a fuel pressure gauge can > diagnosis this problem in two minutes. > > Ed > > "Jerry" > wrote in message > ... >> I've got a 99 XLT with 4.0L SOHC engine with 137K miles. For quite >> some time now it takes several seconds or more of cranking before >> the engine starts. When it does starts it sometimes stumbles until I >> press the gas pedal once or twice. After that it idles and runs >> fine. The cranking is fast, not slow like with a battery that's >> going bad. It doesn't seem to matter whether the engine hot or cold >> (at least as cold as it can get here in Phoenix). >> >> Since the problem started I've replaced the battery (which WAS going >> bad) and the plugs and wires. No change. Any suggestions on where >> to look next? > > |
#6
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lots o crankin before starting
When was the last time you replaced the fuel filter?
Jerry wrote: > I've got a 99 XLT with 4.0L SOHC engine with 137K miles. For quite some > time now it takes several seconds or more of cranking before the engine > starts. When it does starts it sometimes stumbles until I press the gas > pedal once or twice. After that it idles and runs fine. The cranking is > fast, not slow like with a battery that's going bad. It doesn't seem to > matter whether the engine hot or cold (at least as cold as it can get > here in Phoenix). > > Since the problem started I've replaced the battery (which WAS going > bad) and the plugs and wires. No change. Any suggestions on where to > look next? |
#7
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lots o crankin before starting
Probably not a bad fuel filter, since doing what C.E. White posted seemed to
cure the problem. I agree with C.E. White that the fuel pump is most likely the problem. I would take a fuel pressure reading after car sits overnight, and another one after it starts. If fuel pressure is low or zero before starting and ok while it runs, look for a bad fuel pump check valve. A bad fuel filter in my experience usually causes a high speed miss, not a no start situation. I suppose a completely clogged fuel filter would cause a no start situation, but I have never seen it and you would have the high speed miss well before that happens. I am not sure if you have to drop the tank to change or access the fuel pump, but I think so. Not an impossible job for a do it yourselfer, but kind of a pain in the ass. Strongly suggest taking it to a mechanic for a fuel pressure check (or buy a fuel pressure gauge) and if vechile needs new pump, let mechanic do it. It is so much easier if you can get the car on a lift is main reason I say this. SF "AS" > wrote in message ... > When was the last time you replaced the fuel filter? > > Jerry wrote: >> I've got a 99 XLT with 4.0L SOHC engine with 137K miles. For quite some >> time now it takes several seconds or more of cranking before the engine >> starts. When it does starts it sometimes stumbles until I press the gas >> pedal once or twice. After that it idles and runs fine. The cranking is >> fast, not slow like with a battery that's going bad. It doesn't seem to >> matter whether the engine hot or cold (at least as cold as it can get >> here in Phoenix). >> >> Since the problem started I've replaced the battery (which WAS going bad) >> and the plugs and wires. No change. Any suggestions on where to look >> next? |
#8
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lots o crankin before starting
I was just thinking about that. I believe the answer is- never.
AS wrote: > When was the last time you replaced the fuel filter? > > Jerry wrote: >> I've got a 99 XLT with 4.0L SOHC engine with 137K miles. For quite >> some time now it takes several seconds or more of cranking before the >> engine starts. When it does starts it sometimes stumbles until I press >> the gas pedal once or twice. After that it idles and runs fine. The >> cranking is fast, not slow like with a battery that's going bad. It >> doesn't seem to matter whether the engine hot or cold (at least as >> cold as it can get here in Phoenix). >> >> Since the problem started I've replaced the battery (which WAS going >> bad) and the plugs and wires. No change. Any suggestions on where to >> look next? |
#9
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lots o crankin before starting
I think taking it in is probably the best idea:
1. he can diagnose for sure if it's a pressure problem. If not he will, hopefully, be able to diagnose it. 2. any talk of removing the tank puts it out of my comfort zone 3. he can change the fuel filter at the same time as it's probably time Thanks for the input. SF wrote: > Probably not a bad fuel filter, since doing what C.E. White posted seemed to > cure the problem. I agree with C.E. White that the fuel pump is most likely > the problem. I would take a fuel pressure reading after car sits overnight, > and another one after it starts. If fuel pressure is low or zero before > starting and ok while it runs, look for a bad fuel pump check valve. A bad > fuel filter in my experience usually causes a high speed miss, not a no > start situation. I suppose a completely clogged fuel filter would cause a > no start situation, but I have never seen it and you would have the high > speed miss well before that happens. > I am not sure if you have to drop the tank to change or access the fuel > pump, but I think so. Not an impossible job for a do it yourselfer, but > kind of a pain in the ass. Strongly suggest taking it to a mechanic for a > fuel pressure check (or buy a fuel pressure gauge) and if vechile needs new > pump, let mechanic do it. It is so much easier if you can get the car on a > lift is main reason I say this. > SF > > > "AS" > wrote in message > ... >> When was the last time you replaced the fuel filter? >> >> Jerry wrote: >>> I've got a 99 XLT with 4.0L SOHC engine with 137K miles. For quite some >>> time now it takes several seconds or more of cranking before the engine >>> starts. When it does starts it sometimes stumbles until I press the gas >>> pedal once or twice. After that it idles and runs fine. The cranking is >>> fast, not slow like with a battery that's going bad. It doesn't seem to >>> matter whether the engine hot or cold (at least as cold as it can get >>> here in Phoenix). >>> >>> Since the problem started I've replaced the battery (which WAS going bad) >>> and the plugs and wires. No change. Any suggestions on where to look >>> next? > > |
#10
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lots o crankin before starting
"Jerry" > wrote in message ... >I think you hit it. I followed your on/off/on/off... procedure and it >started right up, no visible smoke. So it sounds like the check valve. > > How hard is it to change and where is it located? It is part of the fuel pump. I am pretty sure you will have to drop the tank to replace the pump. Check with a trusted mechanic or the Ford dealer. Ed > > C. E. White wrote: >> It sounds to me like you have a leak in your fuel system or bad check >> valve in the fuel pump. Try this: >> >> Before you actually engage the starter, switch the truck from off to run >> about 5 times, pausing at run for a couple of seconds each time. If the >> truck then starts fine, most likely you have a fuel system problem - I'd >> bet on the check valve in the fuel pump. If you get a lot of black smoke >> when the vehicle first starts, then I'd guess you have a leaky injector. >> A mechanic with a fuel pressure gauge can diagnosis this problem in two >> minutes. >> >> Ed >> >> "Jerry" > wrote in message >> ... >>> I've got a 99 XLT with 4.0L SOHC engine with 137K miles. For quite some >>> time now it takes several seconds or more of cranking before the engine >>> starts. When it does starts it sometimes stumbles until I press the gas >>> pedal once or twice. After that it idles and runs fine. The cranking is >>> fast, not slow like with a battery that's going bad. It doesn't seem to >>> matter whether the engine hot or cold (at least as cold as it can get >>> here in Phoenix). >>> >>> Since the problem started I've replaced the battery (which WAS going >>> bad) and the plugs and wires. No change. Any suggestions on where to >>> look next? >> |
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