Hard starting when cold any ideas?
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Junior User
Joined: Apr 2003
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From: Oklahoma City
Hard starting when cold any ideas?
I have a 91' 4.9 w/E4OD tranny. When I start my truck cold it idles up just like it should but when it idles down it dies. I start it back up it idles up but when it idles down it dies. It will do this over and over. The only way to prevent this is to feather the throttle and keep the RPM's up around 1000 finally after a few minutes of this it warms up and will stay running of course when I take off it wants to die so I have to still feather the throttle.
Once the temp gets up in it, the truck runs great, idles fine and will start fine.
I've pulled the codes and everything looks good, I've also replaced the IAC, plugs, cap, rotor, wires, fuel filter.
I have duel tanks and it does it on both tanks. I've also just recently put on a EGR restrictor but I was having the startup problems before and it didn't change that (sure runs super warm though).
Does anyone have any ideas? I'm wondering if it's either the Engine Coolant Temp Sensor or the Air Charge Temp Sensor. Maybe the TPS or MAP sensor I don't know, they are not showing bad codes but who knows. Oh by the way if anyone thinks I should replace the EGR valve with a new one and take off the restrictor please say so. I'm open to anything. THANKS
Once the temp gets up in it, the truck runs great, idles fine and will start fine.
I've pulled the codes and everything looks good, I've also replaced the IAC, plugs, cap, rotor, wires, fuel filter.
I have duel tanks and it does it on both tanks. I've also just recently put on a EGR restrictor but I was having the startup problems before and it didn't change that (sure runs super warm though).
Does anyone have any ideas? I'm wondering if it's either the Engine Coolant Temp Sensor or the Air Charge Temp Sensor. Maybe the TPS or MAP sensor I don't know, they are not showing bad codes but who knows. Oh by the way if anyone thinks I should replace the EGR valve with a new one and take off the restrictor please say so. I'm open to anything. THANKS
Last edited by okla_stampede; Apr 29, 2003 at 08:34 PM.
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From: redding U.S.A.
Hard starting when cold any ideas?
have you tried running some injector cleaner through it?
When you say it runs super warm, how warm do you mean? If its within a reasonable temperature then the restrictor plate is fine
When you say it runs super warm, how warm do you mean? If its within a reasonable temperature then the restrictor plate is fine
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From: Oklahoma City
Hard starting when cold any ideas?
No it doesn't run "super" warm, fact of the matter the restrictor plate hasn't really caused a noticable overall engine temp change at all. I'm sure it's combusting a little hotter now with more fresh O2 but it's so slight it's not really showing much of a change on my temp gage. What I meant was when the truck warms up a little it idles and runs fine.
I've ran injector cleaner through the intake manifold and have also added it to the tank it didn't seem to help. It was worth a shot even though I've always tried to use a good injector cleaner on a regular basis anyway.
I've ran injector cleaner through the intake manifold and have also added it to the tank it didn't seem to help. It was worth a shot even though I've always tried to use a good injector cleaner on a regular basis anyway.
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From: Quaker Hill ,CT U.S.A.
Hard starting when cold any ideas?
As a easy test remove the idle air controler and clean that out with throttle body cleaner .
Disconnect the battery when you do this - to clean any trouble codes .
The idle controler is on top of the throttle body
Disconnect the battery when you do this - to clean any trouble codes .
The idle controler is on top of the throttle body
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From: Oklahoma City
Hard starting when cold any ideas?
Thanks Chas I'll do that if that doesn't work I might look at replacing the Engine Temp Coolant Sensor too. Any chance it could be my TPS or maybe my MAP sensor?
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From: Quaker Hill ,CT U.S.A.
Hard starting when cold any ideas?
I dont think the map sensor is bad because it would run rough at all engine temps .
Now that you mention it the intake air temp sensor is behind the heater hose on the intake manifold so you might as well do the coolent temp sensor - due to the fact that you have to drain the coolent too so that you can take the heater hose off.
Everyone is "pull the codes" happy . I firmly belive that these trucks ( the older efi trucks ) could benifit from haveing their sensors replaced . I had the map sensor act up in my truck on monday well today I replaced it because it is better safe then sorry - besides the truck has 160,000 miles on it so I think it is due !
Now that you mention it the intake air temp sensor is behind the heater hose on the intake manifold so you might as well do the coolent temp sensor - due to the fact that you have to drain the coolent too so that you can take the heater hose off.
Everyone is "pull the codes" happy . I firmly belive that these trucks ( the older efi trucks ) could benifit from haveing their sensors replaced . I had the map sensor act up in my truck on monday well today I replaced it because it is better safe then sorry - besides the truck has 160,000 miles on it so I think it is due !
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From: Oklahoma City
Hard starting when cold any ideas?
Originally posted by Chas1234
Everyone is "pull the codes" happy
Everyone is "pull the codes" happy
I agree with you with 13-15 year old trucks what can it hurt!
Last edited by okla_stampede; May 1, 2003 at 09:54 PM.
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From: Oklahoma City
Hard starting when cold any ideas?
How much did that MAP sensor run you? Did you get it from Ford or is it an after market? Also have you ever priced an EEC? Just wondering out loud. THANKS
Last edited by okla_stampede; May 2, 2003 at 06:30 PM.
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From: Quaker Hill ,CT U.S.A.
Hard starting when cold any ideas?
Steve I agree that parts shouldnt be randomly replaced.
I replaced my map sensor tested out fine no codes and wow what a difference in the way the truck runs - Map sensor at advance auto was $47.00 .
A guy I used to work with payed $180.00 for the eec on his 1989 f150 .
I replaced my map sensor tested out fine no codes and wow what a difference in the way the truck runs - Map sensor at advance auto was $47.00 .
A guy I used to work with payed $180.00 for the eec on his 1989 f150 .
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From: Oklahoma City
Hard starting when cold any ideas?
OK I replaced the Intake Air Charge Temp Sensor and the Engine Coolant Temp Sensor today. There was a noticable buildup on the IACT sensor. I thought I'd found my problem.
I disconnected the battery and replaced the sensors. The truck is still wanting to die when starting cold. Once it warmed up a little it idled and ran great. I'm telling you this thing runs like a top when it's warm. It seems like every time I replace a part it runs better but still doesn't want to start right.
After seeing the gunk on my IACT it's making me wonder about my injectors. I might try running some more injector cleaner through the Intake manifold tommorrow and look at replacing the TPS. One is only $20 at O'Reilly's.
I disconnected the battery and replaced the sensors. The truck is still wanting to die when starting cold. Once it warmed up a little it idled and ran great. I'm telling you this thing runs like a top when it's warm. It seems like every time I replace a part it runs better but still doesn't want to start right.
After seeing the gunk on my IACT it's making me wonder about my injectors. I might try running some more injector cleaner through the Intake manifold tommorrow and look at replacing the TPS. One is only $20 at O'Reilly's.
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From: Quaker Hill ,CT U.S.A.
Hard starting when cold any ideas?
The only thing I was thinking -vacuum leak!-wouldn't that shop a lean condition when the codes were pulled?
I would have the codes checked again and see if that points you in a new direction . Get the map sensor tested too while you are having the codes pulled . I agree that the parts/sensors are old and should be replaced but why spend the money if you dont have to.
I would have the codes checked again and see if that points you in a new direction . Get the map sensor tested too while you are having the codes pulled . I agree that the parts/sensors are old and should be replaced but why spend the money if you dont have to.