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#1
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1995 Ford Aerostar - No Start
Hi,
I am having a problem with a 1995 Ford Aerostar, 3.0L, 130k miles. The engine will crank, but it won't start. I'm getting 39 lbs of fuel pressure at the fuel rail. I checked one plug wire, and it is getting spark. Can a bad hall effect sensor give me these symptoms? If so, can this be changed without removing the distributor from the engine? Thanks in advance for any help, Mark (If you want to email me, remove the words DIESPAM from my address) |
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#2
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On Thu, 09 Dec 2004 06:07:15 GMT, Mark
> wrote: >Hi, >I am having a problem with a 1995 Ford Aerostar, 3.0L, 130k miles. The >engine will crank, but it won't start. I'm getting 39 lbs of fuel >pressure at the fuel rail. I checked one plug wire, and it is getting >spark. Can a bad hall effect sensor give me these symptoms? If so, can >this be changed without removing the distributor from the engine? >Thanks in advance for any help, You need 3 things to make this engine run: fuel air ignition You checked 2 ( sort of ) but made no mention of checking the air supply. Getting any Malfunction Indicator Code ? >Mark >(If you want to email me, remove the words DIESPAM from my address) > |
#3
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Thanks for the quick reply. I am pretty sure it is getting plenty of air.
The air filter was changed recently. I checked for stored codes, but didn't get any. The reason I suspect that sensor is because, I believe the engine relies on that signal to determine the camshaft position, and to time the fuel injector pulses. Thanks, Mark (If you want to email me, remove the words DIESPAM from my address) Lawrence Glickman wrote: > On Thu, 09 Dec 2004 06:07:15 GMT, Mark > > wrote: > > >Hi, > >I am having a problem with a 1995 Ford Aerostar, 3.0L, 130k miles. The > >engine will crank, but it won't start. I'm getting 39 lbs of fuel > >pressure at the fuel rail. I checked one plug wire, and it is getting > >spark. Can a bad hall effect sensor give me these symptoms? If so, can > >this be changed without removing the distributor from the engine? > >Thanks in advance for any help, > > You need 3 things to make this engine run: > fuel > air > ignition > > You checked 2 ( sort of ) but made no mention of checking the air > supply. > > Getting any Malfunction Indicator Code ? > > >Mark > >(If you want to email me, remove the words DIESPAM from my address) > > |
#4
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On Thu, 09 Dec 2004 06:55:58 GMT, Mark
> wrote: >Thanks for the quick reply. I am pretty sure it is getting plenty of air. >The air filter was changed recently. I checked for stored codes, but didn't >get any. >The reason I suspect that sensor is because, I believe the engine relies on >that signal to determine the camshaft position, and to time the fuel injector >pulses. >Thanks, > >Mark I think I would first rule out the easy stuff, like a vacuum hose leak or disconnection. Hard for me to imagine a non-working or badly adjusted timing sensor -not- throwing a MIL code. I've never had the experience of such. I'll sit back on this and see what Mr Goodwrench has to say about it. Sorry I can't be of further assistance. Lg |
#5
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I'll double check all the hoses and connections tomorrow. Thanks again for your
help. Mark Lawrence Glickman wrote: > On Thu, 09 Dec 2004 06:55:58 GMT, Mark > > wrote: > > >Thanks for the quick reply. I am pretty sure it is getting plenty of air. > >The air filter was changed recently. I checked for stored codes, but didn't > >get any. > >The reason I suspect that sensor is because, I believe the engine relies on > >that signal to determine the camshaft position, and to time the fuel injector > >pulses. > >Thanks, > > > >Mark > > I think I would first rule out the easy stuff, like a vacuum hose leak > or disconnection. Hard for me to imagine a non-working or badly > adjusted timing sensor -not- throwing a MIL code. I've never had the > experience of such. I'll sit back on this and see what Mr Goodwrench > has to say about it. Sorry I can't be of further assistance. > > Lg |
#6
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"Mark" > wrote in message ... > Hi, I am having a problem with a 1995 Ford Aerostar, 3.0L, 130k miles. The > engine will crank, but it won't start. I'm getting 39 lbs of fuel > pressure at the fuel rail. I checked one plug wire, and it is getting > spark. Can a bad hall effect sensor give me these symptoms? If so, can > this be changed without removing the distributor from the engine? > Thanks in advance for any help, > Mark (If you want to email me, remove the words DIESPAM from my address) If you smell gas on the plugs, then try checking the mixture or timing. A timing gun could be useful if the hall effect sensor decide to skip a beat or so. A good mixture is when the pulse width of a cold motor injector is about 30-60ms with good airflow. 30-60ms is about equal to one large stroke from a water bottle mist easily seen when the plugs are removed. |
#7
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In article >,
Mark > wrote: > Hi, > I am having a problem with a 1995 Ford Aerostar, 3.0L, 130k miles. The > engine will crank, but it won't start. I'm getting 39 lbs of fuel > pressure at the fuel rail. I checked one plug wire, and it is getting > spark. Can a bad hall effect sensor give me these symptoms? If so, can > this be changed without removing the distributor from the engine? > Thanks in advance for any help, Check for rot and corrosion at every spark plug *wire* terminal, that means both ends of all six plug wires AND the coil wire. Just because you have spark at one plug doesn't mean you have it at the other five. Odds are, you'll find the coil terminal and coil wire terminal caked with corrosion either at the coil, at the distributor cap or both. (Fords are lousy for this) Check for injector pulse at one or two injectors, this can be done with a 12 volt test light substituted in place of the injector *at* the injector. A #194 bulb (side marker) with the contacts bent straight should be a very close fit to the injector plug and will not load the circuit enough to cause any damage (appx 1/4 amp). To replace the Hall switch, you'd need to remove the distributor, and then remove the drive gear on the bottom of the shaft. if you don't have the proper tools to remove the gear, odds are you'll break the gear. I wouldn't say it's impossible, but it would be very unlikely to have a failed Hall switch and have spark but no signal to the PCM to signal the injectors. Chronic Hall switch failures in Fords went away in the late 80s. Pull a couple of spark plugs, are they wet, dry, black with soot, worn, wrong part #? |
#8
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In article >,
Mark > wrote: > Thanks for the quick reply. I am pretty sure it is getting plenty of air. > The air filter was changed recently. I checked for stored codes, but didn't > get any. If you ran a KOEO self test, you should have got a coolant sensor code with a cold engine that hasn't been/won't run. > The reason I suspect that sensor is because, I believe the engine relies on > that signal to determine the camshaft position, and to time the fuel injector > pulses. Damn, now I'll have to check the wiring diagrams to see if 95 uses a separate crank position sensor to fire the ignition coil. |
#9
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Thanks for all the replies. I got the engine to start by varying the
throttle position while cranking. In order to keep it running, I had to keep my foot slightly on the gas pedal. After about 5 minutes, something kicked in and the engine speed increased to a normal idle on its own. I was able to retrieve a code 172 - system lean bank 1. I'm guessing that there is a vacuum leak somewhere, and the engine compensated for it when it went into closed loop. Does this sound logical or should I be looking at something else? Mark (If you want to email me, remove the words DIESPAM from my address) Mark wrote: > Hi, > I am having a problem with a 1995 Ford Aerostar, 3.0L, 130k miles. The > engine will crank, but it won't start. I'm getting 39 lbs of fuel > pressure at the fuel rail. I checked one plug wire, and it is getting > spark. Can a bad hall effect sensor give me these symptoms? If so, can > this be changed without removing the distributor from the engine? > Thanks in advance for any help, > > Mark > (If you want to email me, remove the words DIESPAM from my address) |
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