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  #16  
Old 08-16-2011, 04:55 PM
CUTiger CUTiger is offline
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Default Re: 3.0 cold start problem

It doesn't sound like an idle problem though since it runs fine, just has trouble starting the first time.

I know you have said that you've cleaned the IAC and checked it while the engine running but try unplugging it while the engine is off/cold and would not normally crank. Then try starting the engine normally while the IAC is unplugged without pressing the gas pedal.
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Last edited by CUTiger; 08-16-2011 at 05:32 PM.
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  #17  
Old 08-16-2011, 05:12 PM
FireRanger FireRanger is offline
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Default Re: 3.0 cold start problem

hmmm. Ok, reading this over again, I see it isn't a a cold idle problem like I thought. You're saying after ~15 seconds it levels off and runs fine? It is still in open loop at that point and has plenty more cold idle running fine. Probably nothing to do with any device, sensor, or gizmo.

So how about about this theory. While it is sitting around for a long period of time, something is leaking into one or more cylinders. Could be leaking injectors, leaking head gaskets, leaking piston rings, leaking whatever else there is to leak. Whatever product is leaking into the cylinders is inhibiting it from firing properly. Adding throttle lets it fire and burn off whatever is in there.

How does the exhaust look when this is happening?
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  #18  
Old 08-16-2011, 05:44 PM
CUTiger CUTiger is offline
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Default Re: 3.0 cold start problem

If the head gaskets, piston rings, or injectors were leaking then they would be experiencing poor performance after it starts and they aren't. Yes excess fuel or coolant leaking into the cylinders would cause the problem they are seeing but it would also show other problems they aren't seeing.
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Underdrive crank pulley
15x8 Procomp Xtreme Alloy 7069
31x10.5x15 Dick Cepek Radial FC II
Cherry Bomb Extreme
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  #19  
Old 08-16-2011, 05:59 PM
FireRanger FireRanger is offline
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Default Re: 3.0 cold start problem

Not necessarily, if they only leak when the cool from contraction.
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  #20  
Old 08-17-2011, 07:07 AM
rcs rcs is offline
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Default Re: 3.0 cold start problem

If an injector was leaking, or there was low fuel pressure in the rail, would that throw a code? I 'm not getting any codes.

I am getting low idle rpm. It also has low power when the AC is on. It's not as noticeable when running on the road, but the idle is lower at startup and warm with the AC on. It seems that the motor doesn't compensate with higher idle with the extra load on it.

I'm thinking of replacing the IAC to see if that makes a difference. Is there a different sensor that is responsible for sensing engine load/idle cycles?
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  #21  
Old 08-17-2011, 07:47 AM
FireRanger FireRanger is offline
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Default Re: 3.0 cold start problem

I'm talking about a slow cold leak while the engine is off. Not fuel pouring out all the time.

The idle not compensating for the AC sounds like an IAC problem. I would replace and see if all the problems go away. It could all be centered around that IAC. Or you could have two things wrong.
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  #22  
Old 08-17-2011, 07:59 AM
rcs rcs is offline
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Default Re: 3.0 cold start problem

Quote:
Originally Posted by CUTiger View Post
It doesn't sound like an idle problem though since it runs fine, just has trouble starting the first time.

I know you have said that you've cleaned the IAC and checked it while the engine running but try unplugging it while the engine is off/cold and would not normally crank. Then try starting the engine normally while the IAC is unplugged without pressing the gas pedal.
I unplugged the IAC before I started it today - totally cold motor. It cranked and tried to start, but wouldn't start without pressing the gas pedal. After I plugged it back in, it cranked a bit but wouldn't start until I had the pedal floored. After that one time starting with the pedal floored after I plugged in the IAC, it starts normally now. It must have gotten flooded with the IAC unplugged. Maybe the IAC is working but not 100%???
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Last edited by rcs; 08-17-2011 at 09:35 AM.
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  #23  
Old 08-17-2011, 10:07 AM
FireRanger FireRanger is offline
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Default Re: 3.0 cold start problem

I don't think unplugging it and running without it is going to tell you anything useful. If you've cleaned it and it is still not idling properly, especially the AC issue, then it is probably faulty.
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  #24  
Old 08-17-2011, 05:56 PM
CUTiger CUTiger is offline
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Default Re: 3.0 cold start problem

Quote:
Originally Posted by FireRanger View Post
I don't think unplugging it and running without it is going to tell you anything useful. If you've cleaned it and it is still not idling properly, especially the AC issue, then it is probably faulty.
The IAC could be staying fully closed at startup not allowing any air by, which would be why opening the throttle allows it to start. I'll agree that it sounds faulty. It could be stuck in a partially open but not open enough for startup causing the low idle and no fluctuation when under load. Not sure where to go next on the startup issue if replacing the IAC does not fix that as well though.
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2003 Ford Ranger XLT 3.0L Flexfuel V6

Underdrive crank pulley
15x8 Procomp Xtreme Alloy 7069
31x10.5x15 Dick Cepek Radial FC II
Cherry Bomb Extreme
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  #25  
Old 08-18-2011, 09:18 AM
rcs rcs is offline
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Default Re: 3.0 cold start problem

Switched out the IAC for a new one yesterday. Battery was unhooked for 30 minutes. No change on cold start today. Still have low idle issue.
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  #26  
Old 08-18-2011, 09:44 AM
FireRanger FireRanger is offline
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Default Re: 3.0 cold start problem

Shit. Ok, well this really leads me back to my previous theory.

Quote:
Originally Posted by FireRanger View Post
So how about about this theory. While it is sitting around for a long period of time, something is leaking into one or more cylinders. Could be leaking injectors, leaking head gaskets, leaking piston rings, leaking whatever else there is to leak. Whatever product is leaking into the cylinders is inhibiting it from firing properly. Adding throttle lets it fire and burn off whatever is in there.

How does the exhaust look and smell when this is happening?
I don't suppose you have a borescope?
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How to: Aux light wiring, relays, & fuses
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  #27  
Old 08-18-2011, 10:40 AM
Tommy2 Tommy2 is offline
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Default Re: 3.0 cold start problem

My truck does something similar - but it's not as bad, so I live with it. Mine is fully tuned up, no ck engine light etc..

When you first start it - it runs and idles fine. But when you first get on the gas - it stumbles. And for the first 2-3 miles of driving you can tell it doesn't have a lot of power. Once warmed up it's perfect. Nothing I'm worried about. Not even noticable some times. Just a little annoying.
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  #28  
Old 08-18-2011, 11:00 AM
FireRanger FireRanger is offline
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Default Re: 3.0 cold start problem

Quote:
Originally Posted by Tommy2 View Post
My truck does something similar - but it's not as bad, so I live with it. Mine is fully tuned up, no ck engine light etc..

When you first start it - it runs and idles fine. But when you first get on the gas - it stumbles. And for the first 2-3 miles of driving you can tell it doesn't have a lot of power. Once warmed up it's perfect. Nothing I'm worried about. Not even noticable some times. Just a little annoying.
Have you tried disconnecting the battery to force it to relearn it's idle. It sounds like its running poor in open loop and fine in closed loop once it is warmed up. Open loop does not use sensors to regulate fuel trim and other settings. It uses some fixed learned settings.
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How to: Aux light wiring, relays, & fuses
Info: 300+ intake threads here on FRF
Info: HID Projectors
How To: NO HEAT Troubleshooting Guide
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  #29  
Old 08-18-2011, 10:18 PM
rcs rcs is offline
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Default Re: 3.0 cold start problem

Quote:
Originally Posted by FireRanger View Post
Shit. Ok, well this really leads me back to my previous theory.



I don't suppose you have a borescope?
Nope, no borescope in the tool box. No fuel pressure gauge either.

I've scheduled an appointment for it to go into the dealer tomorrow and have them check out the fuel system and injectors. I'll let you know what they find.
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  #30  
Old 08-19-2011, 05:23 AM
ranger0130 ranger0130 is offline
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Default Re: 3.0 cold start problem

my truck also runs like shit on a cold start up. But after it warms up its still a little rough.. alot better than when i start it up though.
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