no start when hot weather temp
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More Turbo
Joined: Jan 2010
Posts: 685
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From: Western NC mountains
no start when hot weather temp
First off this isnt a joke as crazy as it is. 96 f150 300 starts and runs great. When it is very warm outside and i turn off the truck it wont start ( no fire) back till truck cools off for about 45 min. Never a problem in the winter starts always. If i leave it running no problem. But if i turn it off and it sets for more than a couple minutes or so, im walking. Only when very warm out side. Thinking of keeping a can of electronic compressed air to spray coil module and pickup with it upside down to get the liquid out cooling things off one at a time. Im stumped
Senior User
Joined: Jan 2007
Posts: 186
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From: watford, ontario
my 90 5.0 did that to me mine was the pickup coil failing when hot my distributor had a bit of play so i bought a brand new ready to drop in dist with everything on it for about 100 bucks at napa
Senior User
Joined: Jan 2007
Posts: 186
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From: watford, ontario
was it a complete drop in distributor ? possible its a bad distributor but not likely
the warmer it gets ouside the warmer it gets under the hood and as heat increases resistance increases reistance is the opposition to current flow or flow of electricity.
so as the component gets hot resistance increses stopping the flow of electricity
( wow i rememberd something from trade school )
the warmer it gets ouside the warmer it gets under the hood and as heat increases resistance increases reistance is the opposition to current flow or flow of electricity.
so as the component gets hot resistance increses stopping the flow of electricity
( wow i rememberd something from trade school )
Senior User
Joined: Jan 2007
Posts: 186
Likes: 1
From: watford, ontario
when it wont start ( trying to remember here cant access my shop key ) i beleive u can take a test light to the neg side of the ign coil and batt pos and crank the engine over if test ligh flashes your pickup coil is working i may be wrong as im just trying to remember and i only did this test on my 89 5.0 a few months ago
you are sure u are loosing spark?
you are sure u are loosing spark?
Thread Starter
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More Turbo
Joined: Jan 2010
Posts: 685
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From: Western NC mountains
U can smell gas when cranking and plug wire off no spark. Cant think of anything anyway that would keep an injector from firing. Yes dropin distributor same cap though. I thought vapor lock originally and put fuel pump in since old was low on pressure anyway. No help. It will run on ether but it knocks bad so that tells me its just busting the ether on compression with hot motor.
Senior User
Joined: Jan 2007
Posts: 186
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From: watford, ontario
are you able to pull codes ?
from what ive read the tfi module is mounted on the fender that could also be overheating cutting out spark
im sure someone with more expiernce will chime in here soon as im more of a late 80's early 90's guy lol
from what ive read the tfi module is mounted on the fender that could also be overheating cutting out spark
im sure someone with more expiernce will chime in here soon as im more of a late 80's early 90's guy lol
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Senior User
Joined: Jan 2007
Posts: 186
Likes: 1
From: watford, ontario
ok if i plug is soaked u will not have visible spark fuel shorts it between the insulator and the electrode
when u put the new distrinbutor in did u reset base timming? if timing is off it will be hard to start when hot could alos explain the knocking
im thinking we may want to go back to the basics when was the last tune up plugs wires cap and rotor how do the plugs look?
have you cleaned the iac? idle air control motor on side of throttle body
hom many miles on truck?
when u put the new distrinbutor in did u reset base timming? if timing is off it will be hard to start when hot could alos explain the knocking
im thinking we may want to go back to the basics when was the last tune up plugs wires cap and rotor how do the plugs look?
have you cleaned the iac? idle air control motor on side of throttle body
hom many miles on truck?
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Posting Guru
Joined: Sep 2008
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Pull codes
Check ACT and ECT, maybe replace each just in case. The truck will monitor these and control fuel and spark based on the readings the PCM gets from each. Consider this especially if your truck is mass air.
Check ACT and ECT, maybe replace each just in case. The truck will monitor these and control fuel and spark based on the readings the PCM gets from each. Consider this especially if your truck is mass air.
Senior User
Joined: Mar 2014
Posts: 433
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From: southern maryland
you need to know weather this is a primary or secondary ignition issue. you have a bypass type ignition system should have a crank sensor a pip in the distributor and a TFI should be on the drivers side fender wall and your ignition coil. check your inputs and outputs find out if the ignition module has the correct input and see if you are getting an output. typically these modules will be fin during a cold start and when warmed up they fail. so determine if the module has what it needs to operate and see if it gives the output. a good spark should be able to jump about an inch gap or you could use a cheap spark tester. i have seen a ford f150 fire the plugs with the engine computer dis connected. you should be able to manually fire the plugs. check for spark at more than one wire. and do you have a tach i doubt you do but if so does it fluctuate during a crank and what about the mil does it go on or off during a crank
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More Turbo
Joined: Jan 2010
Posts: 685
Likes: 1
From: Western NC mountains
Module is on fender in heat sink. 175000 on truck. Less than 20000 on complete tuneup. Keep in mind problem only shows its face when very warm weather. Will sit an idle all day long no probs. Just dont turn off or have to wait 45 min
