4.0 cold start problem

[TimNC]

I am new to this forum but I'm glad you are here. I have a '99 XLT with a 4.0 V6 that will not run if the temp drops below 40 degrees. I have a scan tool but the codes only reveal "lean on left bank" and "lean on right bank." No other codes. Interestingly enough there is no problem at 45 degrees. The engine starts and runs at 45 degrees without incident. But temps below 45 causes severe stalling. I have checked the idle control valve and find nothing wrong. Also occasionally there is a pinging noise at idle something like a lifter click but higher pitched like a spark knock. This is very intermittent but I am suspicious that all these problems are in someway tied together.

thanks for taking the time to read and any help will be greatly appreciated.

Tim
Greensboro NC

 

[Glacier991]

do a search, "O-ring intake".. I think you may find your answer. If not come back here and we can direct you.

 

[TimNC]

Yep, that sounds like it

The OOM12 sounds like the culprit. I called my dealer and their price is $46. I can only imagine what this forum has saved me in diagnosis since I had already called the dealer to make an appointment when I did a search and found ya'll (NC). ONe question though, the plastic pencil shaped object. Is that some sort of pressure control? If not what is it?

Thanks again for all the help.

Tim

 

[TPLYNCH]

I was gonna say you have classic symptoms of bad O-rings. When they are doing the 00M12, you should also have them do the 01M01 work - timing chain cassettes and camshaft tensioners. Those are cause of your "lifter tick", and if you don't get them replaced, they will grenade on you and fill the insides of your engine with little plastic pieces (if they haven't already broken and done that).

ONe question though, the plastic pencil shaped object. Is that some sort of pressure control? If not what is it?

Tim

What pencil shaped object are you referring to? Was it in a picture in a particular thread?

 

[kdogg212001]

wow when i read that i was thinkin i had the same symptoms on my 94xlt!! i am in sacramento california and during december and january we had the temperatures drop about 15 to 30 degrees here and i was starting to have the cold start issue!! one day it was weird like it would crank over but wouldn't fire so i said what the hell!! i gave it a little gas just like a carborated engine and sure enough it fired!! but i knwo i shouldn't have to do that !!!! but also i used that sea foam the other day and ever since i used it my car fires really quick cold or hot!! maybe you need a cleaning?? i mean how many miles are on it about 100k or so right??