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Old 09-11-2002, 09:29 PM
bronco cam bronco cam is offline
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Hard starting when cold

Does anyone know if there is a switch or sensor that acts as a choke on a 96 ford 351? My bronco is hard to start when cold, starts okay after warmed up. Could this problem be the fuel pump not putting out enough pressure when starting?
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Old 09-12-2002, 03:37 PM
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JBronco JBronco is offline
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Hard starting when cold

What do you mean by "hard starting?" Hard to crank, cranks too long, stalls, runs rough, etc.? A bad EGR will cause hard cold starting and rough running until it warms up.
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Old 09-12-2002, 03:50 PM
yosemite yosemite is offline
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Hard starting when cold

Mine cranks too long and then runs rough, surging some, and stalls sometimes especially when put into gear. It runs rough at idle though(surging) all the time and I haven't pinpointed the problem yet.

Changed EGR valve, EVP sensor, PCV valve, spark plugs, wires, air filter, fuel filter and i think thats it.


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Old 09-12-2002, 04:01 PM
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Hard starting when cold

That is the sympton exactly it seems to crank to long then it will fire and die. Then on the second try it will start but seems to run cold (like it has a carb with out a choke) but once it is warmed up it runs fine.


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Old 09-12-2002, 10:06 PM
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Hard starting when cold

My mistake...a bad EGR valve does not cause those symptoms, I was thinking of something else (bad choke pull-off on a carb). But something may be causing your truck to run rich upon startup, wetting the plugs and causing it to run bad until it gets warm enough to dry the plugs. That is what a bad choke pull-off will do, although you do not have a choke, the symptoms are the same.
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Old 09-15-2002, 04:48 PM
bronco351 bronco351 is offline
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Hard starting when cold

My bronco used to do the same thing. I had a 650 cranking amp battery in it. I replaced the battery with a 950 cranking amp battery and it started much easier!!
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Old 09-15-2002, 10:21 PM
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Hard starting when cold

I am having the exact same problem. After starting it wants to idle at 400 to 500 RPMs instead of the usual 900 to 1200 when cold. After warming up it is fine. A plug, distributor cap, and plug wire change did not help. Seems electronic to me. Help us out one of you tech wrenches.
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Old 09-15-2002, 11:51 PM
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Hard starting when cold

[updated:LAST EDITED ON 15-Sep-02 AT 11:53 PM (EST)]I also changed plugs, wires, cap, rotor and I put in a new coil. Still have the same problem. I hope someone has a idea.It seems like i am not getting enough fuel pressure at start up but it does sometimes smell like it is running rich. Any help please.
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Old 09-16-2002, 09:54 AM
sideout2 sideout2 is offline
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Hard starting when cold

Check or clean out the air bypass valve. This is the "choke" of the fuel injection.
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Old 09-16-2002, 12:23 PM
yosemite yosemite is offline
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Hard starting when cold

I posted earlier that mine is doing the same thing. Idles at 600 when idling, especially when cold and surges. Is 900-1000 the norm?

I'm going to check my Idle Air Bypass Valve.

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Old 09-16-2002, 02:59 PM
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Hard starting when cold

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