2004 Jag S Type 6 cyl 3.0

Here are 3 things I know for sure
1. this happened directly after the oil change
2. it surges 250 bewtween 30 mph - 50 mph
3. it doesn't shift smoothly anymore

Can anyone please help me - I clean the throttle body, MAF sensor, and air cleaner. I also reset the ECU. I'm lost and sure would like to hear from someone this has happened to. Like I said it happened directly after I got an oil change and radaitor flush and fill.

 

Which engine do you have? As for model year, I'm guessing 2004 by your username.

Not sure about later models, but on my '02 V6, the harness to one of the O2 sensors is directly in the way when replacing the oil filter. If the harness had to be moved on your car, perhaps the connection was inadvertently disturbed. Is your check engine light illuminated? Such a fault should have set a code.

 

Thanks for the quick response kr98664 - I don't have a check engine light on but I will run my code reader and see what comes up. I have a 2004 Jag S Type 6 cyl 3.0

 

That engine is notorious for the breather hoses that are rubber degrading over time and causing a vacuum leak and it will cause surging just like leaving the oil fill cap off. Theyre under the intake in the back. Past that maybe you have oil in the spark plug wells causing a misfire. New oil runs past old seals much easier than the old oil that was drained. The stype also does not show misfires quickly for some reason so it always helps if you have a code reader that can read misfire counts. I have had stypes register 6000-8000 misfires counts and no check engine light. Surging and misfires will cause the erratic shifting so fix that and that will probobly fix itself. Inspect all vaxxum lines for engine, imt orings(should be green or change them), part and full load breather and air intake tube after the mafs

 

 

Brutal I check the oil cap and it was upside down, I'm gonna check the oil level as well, and take it to the shop and have them check the harness to the O2 sensors. While I'm there have them look at all the vacuum hoses as well. Any other thoughts are appreciated too.

 

Upside down oil cap? Lol only matters for those that cant read upside down
i would have to say that whatever it is, its more likely just coincidence than something they did.
Theres a whole big website online about stories that start with "ever since you worked on my car"......

 

Brutal - LOL I hear just wanted to make sure I mentioned all I know - Thanks for yoir help and will let ya know what they say - I have an appointment at the local shop in the morning. I'll bet there is one of those web site - you know its crazy

 

Just got back from my local auto repair shop - they found a BIG hole on the bottom side of a hose (right side of the throttle body) that connects to the throttle body and replaced it. Drove the for a text run and it runs better still some surges but not as much> My question is will ECU adjust to a different idle since there is no longer a hole?

 

It will, yes.

Should occur almost immediately.

Watch fuel trims and see

 

Should do a hard reset. It will not do it immediatly. Matter of fact i have to remind a few people that if you dont reset adaptations in the ecu after certain repairs you will end up with a car trying to adapt to a issue no longer there creating a whole new set of issues and head scratching

 

Upside down OIL cap is just a 710 by another name.

 

Do you think this hose would have been disturbed during the recent maintenance, or was the timing just a coincidence?

 

UPDATE - surging has stopped. Now the "Transmission Fault" light is on and 1st doesn't seem as responsive. The transmission is shifting smooth - question what should my RPM be at 70 MPH? Thanks for all who has helped me

 

do a hard reset. Disconnect battery cables from the battery and hold the +/- cables together for 30 seconds then hook back up. Past that you need to see what the fault code is for the trans. The hope is it has just done something stupid as a results of the unmetered air causing the surging.

 

think I did the Hard Reset correctly but after I didn't need the radio code? Why? The surging has stopped but one thing I notice there is not a lot of get up and go in 1st gear - the other gaers seem fine but not 1st gear - shfting is soom - also the RMP AT 70 MPH are at 3,000 - 4,000 should it be that way? Happy Sunday all