3.0 Idle Boggin Issue... - Ranger-Forums - The Ultimate Ford Ranger Resource


2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

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Old 02-27-2008
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3.0 Idle Boggin Issue...

Hi All,

I was wondering if anyone has ever ran into this problem I've been noticing with my ford. It seems when it's idling at random times the idle will drop below 1k and start making this little bogging noise but the truck won't stall. It will bog for a few seconds and I give it a little gas and it stops and idles correctly. It will also do this as I come up to a red light, when I come to complete stop it will bog a little bit at random times and I just give it a little gas and it will stop... This issue seems to be getting worse and worse as I drive it and happening more frequently. I just changed the spark plugs all the way around the quad+4.

Any ideas?

2002 Ford Ranger Edge 3.0L V6

Last edited by Prerunner-Ranger; 02-27-2008 at 11:43 AM.
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Old 02-27-2008
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any codes?

Im thinking egr valve or dpfe sensor is your truck is equipped with it.
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Old 02-27-2008
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Originally Posted by Mark98xlt View Post
any codes?

Im thinking egr valve or dpfe sensor is your truck is equipped with it.
Hi Mark,

I don't see any codes come up and no lights come on the dash at all. What did you mean by codes exactly?

Can you elaborate a little for me on the EGR valve & dpfe sensor?


Thanks much in advance!
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Old 02-27-2008
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Very interested in this as mine has the same issues. I was told that the IAC valve was the culprit, but changing it did not help. Neither did injector cleaner, air filter change, spark plugs/wires, or cleaning the MAF and TB.
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Old 02-27-2008
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Quote:
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Very interested in this as mine has the same issues. I was told that the IAC valve was the culprit, but changing it did not help. Neither did injector cleaner, air filter change, spark plugs/wires, or cleaning the MAF and TB.
I've pretty much done all of that as well...

Anybody else have some feedback on this?

Much thanks.
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Old 02-28-2008
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*bump*

any input??
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Old 02-28-2008
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You know it might not be the egr i forgot about the the iac valve its in the back of the engine behind the intake manifold.

Mine did it a couple time where it barely ran like idling at like 500 rpms for liek 10 mins then it would run normal its been like 3-4 years since it did it when I was daily driving the truck then it just went away as soon as it came. It only did it like twice. And again it was when it was really cold here and damp and rainy not kind of weather you would experience in cali.

Also egr is part that helps with emissions Im not sure what year they stopped putting them on there
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Old 02-29-2008
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Originally Posted by Mark98xlt View Post
You know it might not be the egr i forgot about the the iac valve its in the back of the engine behind the intake manifold.

Mine did it a couple time where it barely ran like idling at like 500 rpms for liek 10 mins then it would run normal its been like 3-4 years since it did it when I was daily driving the truck then it just went away as soon as it came. It only did it like twice. And again it was when it was really cold here and damp and rainy not kind of weather you would experience in cali.

Also egr is part that helps with emissions Im not sure what year they stopped putting them on there
So your pointing more towards the IAC valve? I'll try and get it checked out but I need to find a good mechanic.
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Old 03-04-2008
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I was told to check the IAC valve by removing it and connecting a 9 volt battery to the terminals. If the internal parts moved then the valve was good. However a mechanic told me that if cleaning the valve made the problem go away then replace the valve.

My problem did not go away after cleaning so i checked with the 9V battery and the valve did not move. I replaced the IAC valve and i still have the problem.

Will an EGR problem always give a code? I do not have any codes.

Edit: My IAC valve was mounted on top of the throttle body. It is a small silver cylinder with two wires coming from it and two bolts holding it to the backside of the throttle body.
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Old 03-04-2008
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It probably does it at other times and you just don't know it. I would suspect it could be the gas or fuel filter. Fuel filters should be changed every 20K or 30K and depending on what brand of gas you use I would definitely change it. I only use Shell. I stay away from the cheaper places.
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Old 03-04-2008
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It probably does it at other times and you just don't know it. I would suspect it could be the gas or fuel filter. Fuel filters should be changed every 20K or 30K and depending on what brand of gas you use I would definitely change it. I only use Shell. I stay away from the cheaper places.
I just changed my fuel filter recently and I only run premium gas from Chevron.
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Old 03-13-2008
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Bump.

Will an EGR problem always cause a CEL? I do not have a CEL on.
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Old 03-13-2008
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Nope, just like injectors or O2 sensors, they could be bad enough to casue issues, but not trip a CEL.
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Old 03-14-2008
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on my 01, the egr was bad enough to cause issues, and tripped a CEL, but the CEL light was burned out
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Old 04-15-2008
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Anybody have any other input on this issue? What does it seem like this would be boiling down to?

EGR? IAC? Really want to get this fixed as it seems to be getting rougher and rougher when I come up on red lights. Still have no lights on at all on the dash.

I'm going to take the truck in but I want to be able to tell the mechanic what to look for and check.

Thanks guys.
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Old 04-19-2008
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First off, use just 87 octane and save some money. The CPU on our Motors is adjusted for 87 Octane and this may be part of your problem. The CPU may be seeing the engine as running rich and leaning out the fuel mixture and thus getting the stumble/ bogging problem.
MaxB
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Old 04-22-2008
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Quote:
Originally Posted by MaxB View Post
First off, use just 87 octane and save some money. The CPU on our Motors is adjusted for 87 Octane and this may be part of your problem. The CPU may be seeing the engine as running rich and leaning out the fuel mixture and thus getting the stumble/ bogging problem.
MaxB
MaxB you gotta be kidding, how is higher octane going to make my truck bog? If anything it burns cleaner and the truck runs way better on it.
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Old 04-23-2008
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Since you've got an 2002 3.0l, you can rule out the EGR as being a culprit. Why? 'Cause you don't have one. lol

Start at the air box checking your filter, MAF, TB, IAC. How dirty are they? Is the hose from the intake tube to the area next to the oil filler neck intact? What condition are the vacuum lines going to and fro the TB in? Is your TPS functioning properly? ...get out you meter and check... Ever changed the PCV and is it seated properly? There are other items you should check too but the above will start you out.

Now, I'm gonna throw this out here just for kicks. When I first purchased my 02 I was having idle problems at stop lights and also when I had to slow down quickly on the interstate. The engine never did stall out though. I took it to the dealer but they couldn't find anything wrong - at first. It turns out there was something wrong w/ the original PCM calibration which was ACM3. Once the PCM was reflashed the idle problem was gone.
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Old 04-23-2008
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Quote:
Originally Posted by Prerunner-Ranger View Post
MaxB you gotta be kidding, how is higher octane going to make my truck bog? If anything it burns cleaner and the truck runs way better on it.

Twas designed to run on 87.

If you have to run 93 to make it "run way better", you have a problem.

It appears to be getting worse, since continuing to run 93 is no longer masking the problem.

You can be sure, I am not kidding.
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Old 04-23-2008
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Originally Posted by Earl43P View Post
Twas designed to run on 87.

If you have to run 93 to make it "run way better", you have a problem.

It appears to be getting worse, since continuing to run 93 is no longer masking the problem.

You can be sure, I am not kidding.
I don't get 93 octane in california, it only goes up to 91. The truck runs fine on regular gas but I choose to run premium in it because it's a ford. Already getting rammed for gas so might as well get the good ****.
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Old 04-23-2008
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Quote:
Originally Posted by Zs02Edge View Post
Since you've got an 2002 3.0l, you can rule out the EGR as being a culprit. Why? 'Cause you don't have one. lol

Start at the air box checking your filter, MAF, TB, IAC. How dirty are they? Is the hose from the intake tube to the area next to the oil filler neck intact? What condition are the vacuum lines going to and fro the TB in? Is your TPS functioning properly? ...get out you meter and check... Ever changed the PCV and is it seated properly? There are other items you should check too but the above will start you out.

Now, I'm gonna throw this out here just for kicks. When I first purchased my 02 I was having idle problems at stop lights and also when I had to slow down quickly on the interstate. The engine never did stall out though. I took it to the dealer but they couldn't find anything wrong - at first. It turns out there was something wrong w/ the original PCM calibration which was ACM3. Once the PCM was reflashed the idle problem was gone.
Just cleaned my K&N the other day along with my MAF and changed out my oxygen sensors last night. The issue seems to be getting better but I can still feel it at times. The only thing I think it could be is my belt/pulley's or my vacuum leak issue with my A/C.

So far I've:
Cleaned air filter
Cleaned MAF
Replaced Oxygen sensors
Seafoam treatment


Any thoughts?
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  #22  
Old 04-24-2008
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My truck would missfire horribly. I was running codes of random misfires and #4 missfire often. Come to find out it was a bad conection to my inertia valve on the passanger side. It would come loose and cause my fuel pump to not work to it's full potential. After working some vacuum lines and pushing on the plug in on the inertia valve it has not missfired once.

I did not find out about the interia switch until it died for no reason sitting in a parking lot one day. After that it would die driving down the road. The plug would come loose and lose connection causing it to tell the fuel pump not to send fuel. Yes it's strange but it happened. Mine still stumbles sometimes but does not missfire anymore. Mine potentially got worse like you have discribed.
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