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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 12-14-2010
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Icon5 Hard starting in cold

At least it started acting up when it started getting cold..

Here's the facts about the truck first.
120,000 miles, burns about a quart every 5000 miles (also the time frame in which I change oil) About 40,000 miles on plugs and wires. Just changed fuel filter. battery about a year old

So it will crank fine, spinds like a top. Sometimes I have let it sit for 30 seconds or so with the key off and it fires right up. Before I changed the fuel filter I let the key on for a few seconds thinking it was plugged and needed time to build the pressure. Always seemed to fire after doing that.
Sometimes it would fire right away but stumble like lack of fuel. If I shut it off and then tried again with leaving the key on before cranking it would run fine. This led me to think the filter was plugged and why I changed it.
Filter had about 50k on it and what drained out was absolutly filthy.

This morning it wouldn't fire again. Tried my usual tricks but no go. I was already late so I just took the wife's car. So I havn't been able to pull any plugs. Happens wheather it sits in the garage or outside. THis morning was the first time it hasn't started since I changed the filter a week ago. Been starting just fine since then...

Any ideas?
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Old 12-14-2010
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I'd run some injector cleaner and drive it. Maybe high octane
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Old 12-14-2010
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With it being as cold as it is i would say put your battery on a charger or use a meter to see if it has enough amps to start the truck.
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Old 12-14-2010
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Swap out the fuel pump relay.
And throw in a can or two of drygas.
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Old 12-14-2010
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Quote:
Originally Posted by OTRtech View Post
Swap out the fuel pump relay.
And throw in a can or two of drygas.
I have put in a can of seafoam after the fuel filter change and also been using clear gas instead of the ethonal blend.

I'll check out that relay. Do you know where it's located?
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Old 12-14-2010
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I should mention that this dosn't happen all the time. It was maybe 75% before the filter change and then only this one time since
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Old 12-14-2010
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Pull a plug first, if it looks ok and normal, run some fuel injector cleaner thru it with some High octane gas. it doesn't sound like a misfire or anything like that, just sounds like whatever went thru your dirty filter is gumming up your lines.
Your fuel pump relay will be in a box near the battery, Owners manual should tell you what Relay it is, some have it on the underside of the cover.
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Old 12-14-2010
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Originally Posted by StxDangerRanger View Post
Pull a plug first, if it looks ok and normal, run some fuel injector cleaner thru it with some High octane gas. it doesn't sound like a misfire or anything like that, just sounds like whatever went thru your dirty filter is gumming up your lines.
Your fuel pump relay will be in a box near the battery, Owners manual should tell you what Relay it is, some have it on the underside of the cover.
So what's up with the high octane recomendations? High octane is slower burning and will tend to carbon up the combustion chamber. I would think lower octane would be better as it would fire easier....
In Iowa 87 and 91 are clear and 89 has ethonal. So if the goal is to get away from ethonal anything but 89 will do the trick.
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Old 12-15-2010
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Seafoam doesn't like to burn at all. I hope you didn't use a full can in your fuel tank. Honestly, the stuff's over-rated. I use it sparingly, in the vacuum lines, but that's it. NONE goes directly in my oil (crankcase) thank you very much..



GB :)
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Old 12-15-2010
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I'm going to have to disagree on the use of Seafoam, but that's for a differnet thread. :)

I swapped the relays for the pump and ABS. Pump is still acting up and I still have ABS so that leaves the pump. Sometimes I can hear it whirring, sometimes not. Takes about 5-10 cycles turning the key off and on to get it to go.
I have a new pump on order and will swap it out when it comes in. Hopefully it survives long enough as it's a week out and I just filled the tank clear full.
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Old 12-15-2010
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Check the connections to the enertia (sp) switch in the passenger side footwell.
They may have gotten wet and corroded .
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