91 won't spark
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Freshman User
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91 won't spark
hello all,
i have a 91 f150 w/302 and e40d. i am not getting any spark from the coil. battery is charged. has a new coil, new tfi module, and new pick-up. am getting codes of 121 and 111. tps is giving a reading of 3v with key in run position and throttle closed. 5v at wot. bad tps but will that cause a no spark situation? need some help please tell me what to check and what the readings should be. i have a test light and ohm-volt meter. just need the instructions and data ranges.
thank you very much in advance.
jaime
i have a 91 f150 w/302 and e40d. i am not getting any spark from the coil. battery is charged. has a new coil, new tfi module, and new pick-up. am getting codes of 121 and 111. tps is giving a reading of 3v with key in run position and throttle closed. 5v at wot. bad tps but will that cause a no spark situation? need some help please tell me what to check and what the readings should be. i have a test light and ohm-volt meter. just need the instructions and data ranges.
thank you very much in advance.
jaime
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
Put your test light on the Ignition Coil, one side should stay on (+ POS) and the other side (-, tach) should flash while cranking, if no does not flash pull out the SPOUT jumper and try again.
Let us know what you find.
Let us know what you find.
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Joined: Jun 2006
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Originally Posted by faceman1
hello all,
i have a 91 f150 w/302 and e40d. i am not getting any spark from the coil. battery is charged. has a new coil, new tfi module, and new pick-up. am getting codes of 121 and 111. tps is giving a reading of 3v with key in run position and throttle closed. 5v at wot. bad tps but will that cause a no spark situation? need some help please tell me what to check and what the readings should be. i have a test light and ohm-volt meter. just need the instructions and data ranges.
thank you very much in advance.
jaime
i have a 91 f150 w/302 and e40d. i am not getting any spark from the coil. battery is charged. has a new coil, new tfi module, and new pick-up. am getting codes of 121 and 111. tps is giving a reading of 3v with key in run position and throttle closed. 5v at wot. bad tps but will that cause a no spark situation? need some help please tell me what to check and what the readings should be. i have a test light and ohm-volt meter. just need the instructions and data ranges.
thank you very much in advance.
jaime
Yank the cap off the dizzy, and see if it's turning when you are cranking the engine. If not, you go some serious problems. If so, you have some other electrical problems that the parts you replaced haven't addressed yet.
Posting Guru
Joined: Feb 2001
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From: Keweenaw Bay, MI
I had the same problem. What I found was the small ground wire that hooks to the negative terminal lug on the battery was broken loose. I re-established a ground and it started right up. That is a ground for the ECM.
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
Originally Posted by mantta
I had the same problem. What I found was the small ground wire that hooks to the negative terminal lug on the battery was broken loose. I re-established a ground and it started right up. That is a ground for the ECM.
It will stop the fuel injectors and other solenoids from firing and the fuel pump from running.
Posting Guru
Joined: Feb 2001
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From: Keweenaw Bay, MI
I was on the road when this happened so I did not know if it was spark or fuel that it stopped but, re-connecting it did the trick.
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Freshman User
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thank you guys for the input. i have not been able to work on the truck for a few days. hopefully this weekend i can get to it. but keep sending in the ideas and i will keep you posted on my progress.
thanks
jaime
thanks
jaime
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Fleet Owner
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From: Easton,Ks
Originally Posted by faceman1
ohh ya,
one thing i forgot to mention is that the truck is not a maf conversion. also the dizzy does turn.
one thing i forgot to mention is that the truck is not a maf conversion. also the dizzy does turn.
The other side - (NEG, tach) should flash while cranking, if the test light stays on and does not flash then we have a bad switch (Hall Effect Device) in the distributor or TFI Module.
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i have 12v at both the tach and pos side of the coil. just as a reminder, the coil is new, the ignition module is new, the pickup in the distributer is new as well. when i crank the engine the tach side does not flash, it just goes dimm. what next my friends. this widow's son needs some help. thanks
Posting Guru
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From: Keweenaw Bay, MI
I once bought a TFI module for an 87 Crown Vic and it was no good. Running out of ideas like you are, I got another one and it fired right up. However, that may not be the case with yours.
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
Originally Posted by faceman1
i have 12v at both the tach and pos side of the coil. just as a reminder, the coil is new, the ignition module is new, the pickup in the distributer is new as well. when i crank the engine the tach side does not flash, it just goes dimm. what next my friends. this widow's son needs some help. thanks
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Freshman User
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well i checked the resistance and it is at 4 ohms from the tfi ground to the negative ground. still no spark. what is next? can the computers be tested? i am really losing my mind on this one. keep it coming and thanks for the help.