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  #1  
Old 03-23-2011, 03:28 PM
damson144 damson144 is offline
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Default 3.0 cold start problem

hi when i go to start my truck after it has been siting all night or all day during work if you dont give it gas it will die right away and to make it start fine you have to give its some gas for about 10-15 seconds till it idles like normal but once you drive it and turn it off for a bit then it will start no problem and it doesnt matter if it is cold or warm

just wondering if anyone else has had this problem thanks
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  #2  
Old 03-23-2011, 04:34 PM
snipes040 snipes040 is offline
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Default Re: 3.0 cold start problem

well if it does this when it's warm or cold out I would check your alternator or battery. Your battery might not be holding a charge or your alternator might not be charging your battery enough. Could also be something to do with your truck not getting enough fuel to get it to start properly
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Old 03-23-2011, 04:53 PM
FireRanger FireRanger is offline
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Default Re: 3.0 cold start problem

I think you misread it. It starts just fine. It just won't stay running. Nothing to do with electrical or fuel.

On a cold engine, it is in open loop mode, not using any sensors to maintain proper running. On a warm engine, it uses all its sensors to do its thing. That is why it runs differently before it warms up. I would start with cleaning the IAC and throttle body.
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Old 03-23-2011, 05:02 PM
mickblock mickblock is offline
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Default Re: 3.0 cold start problem

Quote:
Originally Posted by FireRanger View Post
I would start with cleaning the IAC and throttle body.
x2

http://www.fordrangerforum.com/how-s...r-control.html
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Old 03-23-2011, 05:37 PM
snipes040 snipes040 is offline
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Default Re: 3.0 cold start problem

oh ya sorry I misread it I was on my iphone. ( lol)
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Old 08-11-2011, 06:18 PM
mrtamone mrtamone is offline
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Default Re: 3.0 cold start problem

did you ever find out the fix for this? I just bought my mom a 94 b3000 with the 3.0 and it does the same thing. I have replaced the iac with no change. Any help would be greatly appreciated
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Old 08-13-2011, 05:37 AM
damson144 damson144 is offline
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Default Re: 3.0 cold start problem

no still havnt figured it out but if i do i will let u know for sure or if u figure it out if u could let me know
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Old 08-13-2011, 07:19 AM
CUTiger CUTiger is offline
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Default Re: 3.0 cold start problem

I'm going to go with the fuel pressure regulator being the problem. Pull the vacuum line from it and check for fuel in the vacuum line/coming from the nipple on the FPR. If theres fuel it needs replaced. THe way I understand EFI engines work is that when you depresses the accelerator(gas) pedal it opens the throttle plate and does not pulse the injectors leaning the engine, when this allows the engine to crank its a sign that it was too rich to start(which is why it just sputters). A typical cause for a rich condition at start is a bad FPR.

This will be located near the fuel rail and will look like similar to this.

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Last edited by CUTiger; 08-13-2011 at 07:22 AM.
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  #9  
Old 08-14-2011, 07:27 AM
rcs rcs is offline
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Default Re: 3.0 cold start problem

I've got the same problem with mine - but its worse with flex fuel. It will not compeletely die if I run gas, but it will die once on start-up with flex fuel and then when I restart it will run ok. If I give it some pedal when starting, it will stay running. It seems to be worse the first start of the day and all other starts during the day seem ok (not great but it will keep running). It always runs/starts good when warm. No codes.

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Old 08-14-2011, 07:35 AM
damson144 damson144 is offline
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Default Re: 3.0 cold start problem

let me know if u guys fined out wut it is
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Old 08-14-2011, 07:54 AM
FireRanger FireRanger is offline
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Default Re: 3.0 cold start problem

Have you cleaned the throttle body an made sure it is closing all the way? Disconnect the battery for 10 minutes to force it to relearn its idle?
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  #12  
Old 08-14-2011, 05:45 PM
rcs rcs is offline
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Default Re: 3.0 cold start problem

Quote:
Originally Posted by CUTiger View Post
I'm going to go with the fuel pressure regulator being the problem. Pull the vacuum line from it and check for fuel in the vacuum line/coming from the nipple on the FPR. If theres fuel it needs replaced. THe way I understand EFI engines work is that when you depresses the accelerator(gas) pedal it opens the throttle plate and does not pulse the injectors leaning the engine, when this allows the engine to crank its a sign that it was too rich to start(which is why it just sputters). A typical cause for a rich condition at start is a bad FPR.

This will be located near the fuel rail and will look like similar to this.

The one on mine doesn't look like this. The vacuum attaches horizontally and it looks like it is built into the rail and not replaceable separately. I didn't detect any fuel in the vacuum line.

I've replaced plugs, wires and checked for vacuum leaks. Also checked the EGR valve. All that checks out fine. The IAC was cleaned and made no difference. I think its working as I've unpluged it and the idle drops way down. Plug it in and it goes back up. I've also checked the vacuum on the motor and it's about 15. Seems a little low, but I'm not sure what it's supposed to be. I'm about ready to take it to the dealer and have them plug it into their scan tool.
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Last edited by rcs; 08-14-2011 at 05:49 PM.
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Old 08-15-2011, 08:10 AM
FireRanger FireRanger is offline
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Default Re: 3.0 cold start problem

Quote:
Originally Posted by FireRanger View Post
Have you cleaned the throttle body an made sure it is closing all the way? Disconnect the battery for 10 minutes to force it to relearn its idle?
......
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  #14  
Old 08-16-2011, 07:52 AM
rcs rcs is offline
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Default Re: 3.0 cold start problem

Quote:
Originally Posted by FireRanger View Post
Have you cleaned the throttle body an made sure it is closing all the way? Disconnect the battery for 10 minutes to force it to relearn its idle?
I've cleaned the MAF and throttle body and IAC. None looked bad. Throttle body is closing.
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Old 08-16-2011, 08:21 AM
FireRanger FireRanger is offline
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Default Re: 3.0 cold start problem

Disconnect the battery for 10 minutes to force it to relearn its idle????
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How to: Aux light wiring, relays, & fuses
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Info: HID Projectors
How To: NO HEAT Troubleshooting Guide
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