injector resistor
Thread Starter
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Lead Driver
Joined: Oct 2004
Posts: 8,062
Likes: 35
From: Central Oregon
injector resistor
Does anyone know where the injector resistor is, or have a picture of it. My 90 Areo with a 4.0 engine is still having issues, random CEL with no codes. I have run almost all the test that I down loaded from here and chenged the battery, alt. crank sensor, TPS, HCS, IBS, spark plugs and wires and coil pack. The HCS helped and the crank sensor helped, going down the road she runs fine, CEL will come on after driving 15-16 miles, but does not effect the way it runs. The one problem that contiues is when pulling away from a idle she wants to die and not start untill you hold the gas all the way open and it will sputter and then smooth out. Had a machanic friend say that it maybe the resistor for the injectors is going bad. Any thoughts about this? Thanks
Post Fiend
Joined: Apr 2005
Posts: 5,720
Likes: 5
From: Washington state
i would start with cleaning the socket contacts and replacing the ECU relay
RY71
http://info.rockauto.com/SMP/SMPDetail3.html?RY71.html
only a $12 part at rockauto
but I don't think that is your problem
dying on warm driveaway and warm hard starting are signs of too rich an air/fuel mix. my guess=leaking injectors, especially if those are the 17 year old originals and have not been removed and professionally ultrasonically tank cleaned.
having to hold the gas pedal to the floor is a sign of far too rich a warm start mix. max TPS input tells ECU to shut off all FI activity until the engine starts and clears out extra fuel.
also test fuel pressure at the rail for max and min. pressure.
is there fuel in the FPR vacuum line?
RY71
http://info.rockauto.com/SMP/SMPDetail3.html?RY71.html
only a $12 part at rockauto
but I don't think that is your problem
dying on warm driveaway and warm hard starting are signs of too rich an air/fuel mix. my guess=leaking injectors, especially if those are the 17 year old originals and have not been removed and professionally ultrasonically tank cleaned.
having to hold the gas pedal to the floor is a sign of far too rich a warm start mix. max TPS input tells ECU to shut off all FI activity until the engine starts and clears out extra fuel.
also test fuel pressure at the rail for max and min. pressure.
is there fuel in the FPR vacuum line?
Post Fiend
Joined: Oct 2005
Posts: 5,242
Likes: 0
From: Kiev, Ukraine
No, it is power supply problem, I'm nearly sure. Try to run wire from + term. of Battery directly to ECU to be sure. And not to ECU onlu but to + terminal of coil.
Before you replace expencive parts do the cheap staff first.
Before you replace expencive parts do the cheap staff first.
Thread Starter
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Lead Driver
Joined: Oct 2004
Posts: 8,062
Likes: 35
From: Central Oregon
Originally Posted by copper_90680
My vote is with either the MAF or the IAC.
What are the HCS and the IBS?
What are the HCS and the IBS?
Thread Starter
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Lead Driver
Joined: Oct 2004
Posts: 8,062
Likes: 35
From: Central Oregon
Originally Posted by 96_4wdr
i would start with cleaning the socket contacts and replacing the ECU relay
RY71
http://info.rockauto.com/SMP/SMPDetail3.html?RY71.html
only a $12 part at rockauto
but I don't think that is your problem
dying on warm driveaway and warm hard starting are signs of too rich an air/fuel mix. my guess=leaking injectors, especially if those are the 17 year old originals and have not been removed and professionally ultrasonically tank cleaned.
having to hold the gas pedal to the floor is a sign of far too rich a warm start mix. max TPS input tells ECU to shut off all FI activity until the engine starts and clears out extra fuel.
also test fuel pressure at the rail for max and min. pressure.
is there fuel in the FPR vacuum line?
RY71
http://info.rockauto.com/SMP/SMPDetail3.html?RY71.html
only a $12 part at rockauto
but I don't think that is your problem
dying on warm driveaway and warm hard starting are signs of too rich an air/fuel mix. my guess=leaking injectors, especially if those are the 17 year old originals and have not been removed and professionally ultrasonically tank cleaned.
having to hold the gas pedal to the floor is a sign of far too rich a warm start mix. max TPS input tells ECU to shut off all FI activity until the engine starts and clears out extra fuel.
also test fuel pressure at the rail for max and min. pressure.
is there fuel in the FPR vacuum line?
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Post Fiend
Joined: Apr 2005
Posts: 5,720
Likes: 5
From: Washington state
bertha,
you must love that old girl, you've put some parts store bucks into her
hope you find the problem soon.
mine is starting to show her age. think towing days are about over
looking at a Dodge 1 ton Cummins diesel
you must love that old girl, you've put some parts store bucks into her
hope you find the problem soon.
mine is starting to show her age. think towing days are about over
looking at a Dodge 1 ton Cummins diesel
Originally Posted by bertha66
HCS heat control senser and IBS, sorry ment IAC and I did change the MAF
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Thread Starter
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Lead Driver
Joined: Oct 2004
Posts: 8,062
Likes: 35
From: Central Oregon
Originally Posted by 96_4wdr
bertha,
you must love that old girl, you've put some parts store bucks into her
hope you find the problem soon.
mine is starting to show her age. think towing days are about over
looking at a Dodge 1 ton Cummins diesel
you must love that old girl, you've put some parts store bucks into her
hope you find the problem soon.
mine is starting to show her age. think towing days are about over
looking at a Dodge 1 ton Cummins diesel
Post Fiend
Joined: Jun 2002
Posts: 13,873
Likes: 3
From: Atlanta GA
Check the coil pack. I know it is a hassle to get to on a 4.0L Aerostar and you have to remove it to test and inspect the potting , but, I think that might be the problem if it is not throwing codes and it appears to be a power supply problem.
Thread Starter
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Lead Driver
Joined: Oct 2004
Posts: 8,062
Likes: 35
From: Central Oregon
Originally Posted by rebocardo
Check the coil pack. I know it is a hassle to get to on a 4.0L Aerostar and you have to remove it to test and inspect the potting , but, I think that might be the problem if it is not throwing codes and it appears to be a power supply problem.
Postmaster
Joined: Sep 2003
Posts: 4,452
Likes: 1
From: Southern California
Allen,
Looking back through the thread, I realize that few of us answered your original question about the whereabout of the injector resistors. As far as I know, the injectors do not have a resistor per se. Whatever resistance you read across the terminals is the resistance of the coil winding. My guess is that you should measure them all with an ohmeter, in both directions since there might be an internal diode. If the resistances are about the same for all six injectors, I'd say you are OK. Then, all you have to worry about is whether they are plugged up or leaking.
Looking back through the thread, I realize that few of us answered your original question about the whereabout of the injector resistors. As far as I know, the injectors do not have a resistor per se. Whatever resistance you read across the terminals is the resistance of the coil winding. My guess is that you should measure them all with an ohmeter, in both directions since there might be an internal diode. If the resistances are about the same for all six injectors, I'd say you are OK. Then, all you have to worry about is whether they are plugged up or leaking.
Thread Starter
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Lead Driver
Joined: Oct 2004
Posts: 8,062
Likes: 35
From: Central Oregon
Yes, the original question was answered, and I thank you. All the rest has been Very helpfull, The random CEL has been driving me very crazy and it's not much of a drive, so thanks to all and I will let you know if I find it.
Post Fiend
Joined: Apr 2005
Posts: 5,720
Likes: 5
From: Washington state
no internal inductive kickback protection diode in the Ford injectors.
all the protection is done on the output of the injector FETs in the ECU/PCM
the CEL will pulse on/off with each detection of a cyl miss.
the cyl miss algorithm requires a certain preset # of misses in a preset time period to turn the CEL on permanently and set a miss code.
cyl. miss is detected by the position timing of crank sensor, camshaft sensor and ign PIP sensing which is determinded by engine model and year. OBDI or II and distributor or EDIS
OBDII EDIS will pinpoint one particular cylinder missing and giving problems with unique cyl # CEL set and real time scanner monitoring
all the protection is done on the output of the injector FETs in the ECU/PCM
the CEL will pulse on/off with each detection of a cyl miss.
the cyl miss algorithm requires a certain preset # of misses in a preset time period to turn the CEL on permanently and set a miss code.
cyl. miss is detected by the position timing of crank sensor, camshaft sensor and ign PIP sensing which is determinded by engine model and year. OBDI or II and distributor or EDIS
OBDII EDIS will pinpoint one particular cylinder missing and giving problems with unique cyl # CEL set and real time scanner monitoring