PLEASE HELP !!! Replaced everything....still intermitent miss real bad
Hello all....this is my first time posting on a site like this so I hope that I am doing this the correct way. Also before I get started I would certainly like to thank everyone who has played a part in creating this site...it has been a real help for me
I have a 1997 dodge dakota 3.9 4 wheel drive automatic. I have a problem with the vehicle sputtering and running ruff. It will start and idle fine..then as I drive within a block or so it will start to sputter a little bit..then it will progress to a feeling like it is running only on 2 cylinders. When I first noticed the problem about a month ago it would come and go...but now it seems to happen all the time
Codes were at one point : Random cylinder misfire, and 02 upstream high voltage
"Things I Have Replaced"
o2 censor from the dealer "upstream"
"Thing I Have Checked"
Fuel pressure "Put guage in windshield..drove with and without problem occuring...steady reading always good"
Map censer 4.7 at output....less 1volt per 5 psi
Tps censor "closed and wide open" checked good
Fuel injectors...Basic test all within range of eachother
After all this there are no codes...but still runs like crud after a block or so...also does it in nutral...and will do it even if I restart truck
I also followed the instructions for the coil wire and extra grounds to fuel rail and coil. Also checked coil pigtail.......... I am so lost at this point !! I don't know what else to do. Any feedback would be greatly appreciated. Thanks in advance for any help
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Last edited by jaysway007; 05-08-2013 at 06:07 PM..
I also forgot to mention that I disconnected the exhaust after the upstream o2 censer to see if a clogged cat could be my problem......but there was no change...still had problem "except realy loud when driving"
A faulty CTS (Coolant temp sensor) can go bad either open or closed. On startup, depending on which way it fails, it could send a "cold" signal which is what the engine needs for a cold startup, but once the engine warms up it still tells the PCM that the engine is cold causing it to run waay too rich.
Have you checked the condition of the plugs? Is it fouling the plugs? If so it fuel fouled?
It seams to only do it after it warms up for a minute.....It is not throwing any codes at all now....I have not checked the plugs, but I suspect that the plugs are ok because it runs great and sounds great ,and has a perfect smooth idle and rev until I drive it a little bit.......also I just took it for another ride and this time it ran great for about ten blocks...then ran rough..but it seems like I can get the problem to come and go if I get on and off the gas a little bit...also I have a innovative motorsports open tune obd 2 ot-2 unit...it shows codes and lets me clear them but not much else I will look online and get instructions on testing temp sensor and then report results
WOW !!! I just took a look at where that coolant sensor is located...looks like a real pain in the rear to replace, and hard to check also...I can remove ac comp and get to it easy...but before I do that I wanted to ask... Does that sensor control the dash readout? because if so my dash is reading fine...cold on start up...then gradually rising to operating temp. Is that enough to verify that it is working or do you think that I need to perform actual test on unit itself?
Some of the other guys on here know a lot more about these particular vehicles than I do. but if you could trace the wires and maybe probe them in a more accessible place. You would check it cold, then at operating temp and compare the two readings, If you have a repair manual for it they usually give an actual resistance value. http://www.aa1car.com/library/coolant_sensors.htm
Personally I would do a plug read and see what color etc. they are. If they are black or smell of fuel it could lead you to a rich condition whereas if they are white or burned it could be lean. At this point you don't know if your engine is rich or lean and it could help with diagnosis