cold drivability

[RamDiver]

An interesting item ..... I went into the OBD 2 functions to see if anything was logged there. It shows that it passed all the monitors, there were no "freeze frames" but .... cyl #7 and cyl #8 had 4 misfires during the last trip. Also cyl #6 showed 1 misfire. Not enough to trigger the CEL but ????
I think I am going to start by retorquing the intake and then change out a couple of coils.
The down side is that the coils on cyl #7 and #8 are the two nastiest ones to access. I have found it is a lot easier if I pull the fender liners.

That's great news, now you have evidence and a direction to pursue. Sometimes poking around in those devices pays off.

You might start with a close inspection after removing one of those coil packs. Make sure you grab your reading specs first if your eyes are like mine and you have a good LED light.

.

 

[Hagar1]

That's great news, now you have evidence and a direction to pursue. Sometimes poking around in those devices pays off.

You might start with a close inspection after removing one of those coil packs. Make sure you grab your reading specs first if your eyes are like mine and you have a good LED light.

.

OH, I remember a time when I could see the gender of a mosquito from 50 feet away. Now, not so much, need my glasses and sometimes a loupe or magnifying glass just for ordinary, every day stuff.
The joys of getting old.

 

[RamDiver]

OH, I remember a time when I could see the gender of a mosquito from 50 feet away. Now, not so much, need my glasses and sometimes a loupe or magnifying glass just for ordinary, every day stuff.
The joys of getting old.

Yup, me too.

I recall I once worked on mechanical watches and was able to see the miniature bits. Of course, that was prior to laser surgery in the 90s. All my closeup vision was instantly challenged but no more glasses for other activities.

Getting old does beat the alternative, though.

.

 

[Hagar1]

Yup, me too.

I recall I once worked on mechanical watches and was able to see the miniature bits. Of course, that was prior to laser surgery in the 90s. All my closeup vision was instantly challenged but no more glasses for other activities.

Getting old does beat the alternative, though.

.

Back in the "day" I used to go hunting in the Marlborough Forest. Early 70's.
I'm putting the truck "on hold" for a week or so because a couple of friends of mine want to take a look. One of them has a Snap on scanner that "might" give more info.

 

[RamDiver]

Back in the "day" I used to go hunting in the Marlborough Forest. Early 70's.
I'm putting the truck "on hold" for a week or so because a couple of friends of mine want to take a look. One of them has a Snap on scanner that "might" give more info.

It's a small world today.

You have my correct area, Marlborough Forest access is about a block & a half from my place. I used to mountain bike in there when folks weren't shooting creatures.

Only the more experienced crowd knows of this area as Marlborough.

IIRC, I read somewhere that this entire area was part of Kemptville/North Grenville.

I did speak to a resident on the South side of Donnelly Road and was informed that he and several other neighbours have a Kemptville Postal Code and that they have endless grief with deliveries.


I'm looking forward to your impending investigation and hearing the results.

.

 

[Hagar1]

It's a small world today.

You have my correct area, Marlborough Forest access is about a block & a half from my place. I used to mountain bike in there when folks weren't shooting creatures.

Only the more experienced crowd knows of this area as Marlborough.

IIRC, I read somewhere that this entire area was part of Kemptville/North Grenville.

I did speak to a resident on the South side of Donnelly Road and was informed that he and several other neighbours have a Kemptville Postal Code and that they have endless grief with deliveries.


I'm looking forward to your impending investigation and hearing the results.

.

I used to live in Kemptville back in the day.

 

[Hagar1]

Man,I was gonna guess tranny all the way...up until you said it backfired..bet one of these fellas will nail it for ya though

I had an opportunity to spend 4 hours on the highway today and did a bunch of testing. I did a misfire monitor on each cylinder with only 1 misfire on a couple of cylinders. Nothing remarkable. I switched over to transmission real time info and there is when it got interesting. I'm running at 100 kilometers per hour, and showing about 1650 RPM on the Tach but .... my diagnostic box says I'm in 4th. I speed up to about 105 and after a bit, it shows 5th but I never got to see 6th.
This morning when I was going up the hill that shows the problem cold, I manually down shifted the trans with the switch on the gear shift lever. It worked much better.
I guess I'm getting too old and too far out of touch and suffered from an age old Technician problem called "Tunnel Vision." I'm going to explore the trans behaviour some more.
I used to advocate "thinking globally" but I, myself failed on it this time.

 

[Hagar1]

The truck has been sitting in the driveway for about 24 hours and has not been started. I went out today to see if I could find anything interesting and this is what I found..... Ambient temp 25.0 C, Engine coolant temp 22.0 C AND Transmission fluid temp 205.0 C Something is wonky in the transmission department.

I figured out the "wonky" in the transmission temp reading, that number is just a "default" until the vehicle is started. Once I started it, the temp on the cold vehicle were all within a degree.

Something else that I just thought of ...... the cold driveability and the drop in fuel economy happened at the same time, went from 23 MPG down to 14 MPG. I always convert to miles per gallon because it is more convenient for my old brain. Liters divide by 4.55 equals Imperial Gallon. Kilometers multiplied by 0.6209 equals miles. Been using that formula since 1976.

 

[Hardracer]

The truck has been sitting in the driveway for about 24 hours and has not been started. I went out today to see if I could find anything interesting and this is what I found..... Ambient temp 25.0 C, Engine coolant temp 22.0 C AND Transmission fluid temp 205.0 C Something is wonky in the transmission department.

All I can say is that when I was up in north fla.earlier year maybe late last year..it was cold(for me,nothing for you other guys...lol)..like in the teens..I went to leave the hotel ,it would not move...had to sit there for bout 15min.for the temps come up..then drove fine..only time my truck has been that cold since I've owned it...I roughly drive 6miles to work and 6 back...if my tranny hits 120 that's alot...thats all at normal fla temps..roughly 60-100f where I'm at...highest I've ever seen my tranny 180f area.

 

[Hagar1]

All I can say is that when I was up in north fla.earlier year maybe late last year..it was cold(for me,nothing for you other guys...lol)..like in the teens..I went to leave the hotel ,it would not move...had to sit there for bout 15min.for the temps come up..then drove fine..only time my truck has been that cold since I've owned it...I roughly drive 6miles to work and 6 back...if my tranny hits 120 that's alot...thats all at normal fla temps..roughly 60-100f where I'm at...highest I've ever seen my tranny 180f area.

I discovered another interesting thing.... key on, engine off, the default temp is 205C. As soon as it started the trans temp went to more or less the same as the cold engine. Around 18C.
I'm still puzzled.

 

[Tulecreeper]

All I can say is that when I was up in north fla.earlier year maybe late last year..it was cold(for me,nothing for you other guys...lol)..like in the teens..I went to leave the hotel ,it would not move...had to sit there for bout 15min.for the temps come up..then drove fine..only time my truck has been that cold since I've owned it...I roughly drive 6miles to work and 6 back...if my tranny hits 120 that's alot...thats all at normal fla temps..roughly 60-100f where I'm at...highest I've ever seen my tranny 180f area.

Then you wouldn't be able to drive in this area ever between Thanksgiving and the Spring Equinox. In February we had a few days when it dropped to -10 F. for a couple days. Granted, that was quite a bit below average, but you get the picture. Today is cooler than it has been, only 97, but we've had over 100 half the days for about a month.

 

[Hardracer]

Then you wouldn't be able to drive in this area ever between Thanksgiving and the Spring Equinox. In February we had a few days when it dropped to -10 F. for a couple days. Granted, that was quite a bit below average, but you get the picture. Today is cooler than it has been, only 97, but we've had over 100 half the days for about a month.

Haha..definitely not right away anyways.

 

[Hagar1]

Update ...... Had a friend that used to work in a Chrysler dealership come over yesterday with his Snapon Scanner. He could find nothing, no codes, no anomalies of any sort.
Problem isn't as bad as it was early on so I'm starting to lean towards a fuel quality problem or seriously dirty injectors. I've put through 2 cans of injector cleaner. Going to do another with the next fill up.

 

[Hagar1]

Update ..... I got to spend some time looking at the info on the scanner line by line and I observed that the 2/2 O2 sensor is incredibly lazy. It may move from .83V to maybe .72V all the other sensors appear to be "active."
Can anybody enlighten me as to the position of the sensors as far as 1/1, 1/2, 2/1 and 2/2. I don't have access to a shop manual.
I'm going to replace it and see if it improves.
Thanks

 

[Hagar1]

Well, I'm at a dead end on this. A friend and I checked the injectors and coils with a lab scope, no faults found. All readings that we see are pretty darn normal, even things like short term adaptive are not out of line. The drift between -3 to +3, O2 sensors are switching properly. Temp sensors seem to be reading accurately. Throttle body was cleaned a second time just to make sure.
I'm missing something but I just don't know what it is.
I'm open to any suggestions

 

[Wild one]

Well, I'm at a dead end on this. A friend and I checked the injectors and coils with a lab scope, no faults found. All readings that we see are pretty darn normal, even things like short term adaptive are not out of line. The drift between -3 to +3, O2 sensors are switching properly. Temp sensors seem to be reading accurately. Throttle body was cleaned a second time just to make sure.
I'm missing something but I just don't know what it is.
I'm open to any suggestions

Might be time to pull the injectors and send them out for cleaning and flow testing.If you've verified it's got spark and the cam is okay,about all that's left is a fuel flow problem through the injectors themselves.They can be firing on time,but if the pintle is clogged or bad,they won't flow the proper amount of fuel. Check with your local diesal shops some of the better ones are set-up to clean and flow test injectors

 

[Hagar1]

Might be time to pull the injectors and send them out for cleaning and flow testing.If you've verified it's got spark and the cam is okay,about all that's left is a fuel flow problem through the injectors themselves.They can be firing on time,but if the pintle is clogged or bad,they won't flow the proper amount of fuel. Check with your local diesal shops some of the better ones are set-up to clean and flow test injectors

This is a 5.7 hemi, I thought injectors on gas engines were a throw away item.
What doesn't add up for me is the adaptive are not showing a problem. I could almost live with the cold drivability but at the price of gas, the drop from 23 to 14 might is the real problem.

 

[Wild one]

This is a 5.7 hemi, I thought injectors on gas engines were a throw away item.
What doesn't add up for me is the adaptive are not showing a problem. I could almost live with the cold drivability but at the price of gas, the drop from 23 to 14 might is the real problem.

If you don't have access to a shop that can clean and flow rest them,then yes they are a throw away item,lol.
My buddy owns a hi-po Diesal shop and he's one of the few shops around that can clean and flow injectors,he says he can also do most gas injectors,he also fills my nitrous bottles for less then anybody else,but i also spoil him with the wifes cookies when ever i need a few bottles filled,my wifes cookies get me a boatload of favours ,lol

 

[Hagar1]

If you don't have access to a shop that can clean and flow rest them,then yes they are a throw away item,lol.
My buddy owns a hi-po Diesal shop and he's one of the few shops around that can clean and flow injectors,he says he can also do most gas injectors,he also fills my nitrous bottles for less then anybody else,but i also spoil him with the wifes cookies when ever i need a few bottles filled,my wifes cookies get me a boatload of favours ,lol

What really bothers me is that I used to be darn good at this sort of stuff. I guess my advancing years are having an effect after all. I am troubled by the "thing" with the short term adaptive being so close to zero. I would think that an increase in fuel consumption would reflect somewhere.

 

[RamDiver]

What really bothers me is that I used to be darn good at this sort of stuff. I guess my advancing years are having an effect after all. I am troubled by the "thing" with the short term adaptive being so close to zero. I would think that an increase in fuel consumption would reflect somewhere.

Back in the day, cleaning the points and or drying out the distributor cap was often an easy fix. Vehicles could often be kept running with a bit of TLC.

Our years may be running away with time but these vehicles have become increasingly more complex, year after year.

Without the appropriate diagnostic gear and experience, many faults are a challenge for those who work with this stuff on a daily basis.

Try to cut yourself some slack and be happy with the learning process. You can most likely correct a number of issues with a little guidance.

.