RPM Fluctuates only when driving Pls Help
#1
RPM Fluctuates only when driving Pls Help
I have a 2004 Jaguar S-Type V6. I purchased it about 8 months ago and never have had a problem until recently. The only problem I had until now (I do not think it is related, but have no clue if it is related or not) was a short metal rattling noise only once in a great while when I started the car. The noise would only happen right after I had let go of the key to start the engine, and end within 1 second of it starting. The sound never seemed to lead to anything else, but it did increase in frequency not duration though, but has almost stopped as of recent (only has happened once in the last 2 weeks).
Valvoline...
I went to a Valvoline to have my oil changed (I know a mistake) and they made some rather large mistakes which may or may not have a hand in the current problem. I am going to detail them just in case it is related or helps diagnose the problem.
They drained my current oil and put 5W 30 Synthetic Oil in and went to show me the air filter. The guy accidentally ripped the entire air filter housing, vacuum tube, clamps etc off. He tried to quickly put it back on before I said something and started hitting it with a wrench to have it fit back on. I told him to stop, and use a screwdriver to which he apologized and did, but had a lot of trouble with it. After everything was done he told me to start my car, but it said "Restricted Access" and would not start. He then said he forgot to put the oil cap on, and told me to restart it, and it worked fine.
The problem...
I noticed the problem about 1-2 days after leaving Valvoline. The car's RPMs would be fine at idle around 750 RPMs but when I was driving around 35 - 45 MPH and slowly accelerating the RPMs would fluctuate or jump up and down 250 RPMs.
I then took it to a local shop that has worked on it before, and they said that it appeared Valvoline had gotten oil on the Mass Air Flow sensor so they cleaned it, and noted that the MAF sensor may need replaced if it continues.
I took the car home and for the first 1 - 2 days it ran fine, then on day 2 or 3 it started with the RPMs jumping about and down by 250 RPMs when slowly accelerating from 35 - 45 MPH. Also when slowing down the RPMs would go down choppy in incriments of 50 - 100 RPMs, and not smoothly like it used too. Each day it would get a little worse and now the car seems to be shifting at odd times, and the car is starting to hesitate when driving (almost like you hit a small puddle of water when driving).
I went to open the housing containing the air filter and noticed that attached to the front bottom of the air filter housing there was around a 1" plug with nothing plugged into it. I took a pic but do not know how to upload the pic. Anyway I was not sure if there was or is suppose to be something plugged in there, but currently there is not.
I went on to test the MAF by flicking the MAF while the car was running and the car studdered and stalled other times. I also noticed by simply moving around the vacuum hose that at times was enough to stall the car as well. When I ran the car without the MAF plugged in it failed to start once and started and stopped another time, and two other times started fine, but RPMs dropped in a choppy way around 100 RPMs at a time and not smoothly.
Any ideas on
1. Is something suppose to be plugged into the electrical outlet thingy on the bottom front of the air filter housing?
2. What is causing the RPMs to fluctuate and the car to studder when slowly accelerating?
Valvoline...
I went to a Valvoline to have my oil changed (I know a mistake) and they made some rather large mistakes which may or may not have a hand in the current problem. I am going to detail them just in case it is related or helps diagnose the problem.
They drained my current oil and put 5W 30 Synthetic Oil in and went to show me the air filter. The guy accidentally ripped the entire air filter housing, vacuum tube, clamps etc off. He tried to quickly put it back on before I said something and started hitting it with a wrench to have it fit back on. I told him to stop, and use a screwdriver to which he apologized and did, but had a lot of trouble with it. After everything was done he told me to start my car, but it said "Restricted Access" and would not start. He then said he forgot to put the oil cap on, and told me to restart it, and it worked fine.
The problem...
I noticed the problem about 1-2 days after leaving Valvoline. The car's RPMs would be fine at idle around 750 RPMs but when I was driving around 35 - 45 MPH and slowly accelerating the RPMs would fluctuate or jump up and down 250 RPMs.
I then took it to a local shop that has worked on it before, and they said that it appeared Valvoline had gotten oil on the Mass Air Flow sensor so they cleaned it, and noted that the MAF sensor may need replaced if it continues.
I took the car home and for the first 1 - 2 days it ran fine, then on day 2 or 3 it started with the RPMs jumping about and down by 250 RPMs when slowly accelerating from 35 - 45 MPH. Also when slowing down the RPMs would go down choppy in incriments of 50 - 100 RPMs, and not smoothly like it used too. Each day it would get a little worse and now the car seems to be shifting at odd times, and the car is starting to hesitate when driving (almost like you hit a small puddle of water when driving).
I went to open the housing containing the air filter and noticed that attached to the front bottom of the air filter housing there was around a 1" plug with nothing plugged into it. I took a pic but do not know how to upload the pic. Anyway I was not sure if there was or is suppose to be something plugged in there, but currently there is not.
I went on to test the MAF by flicking the MAF while the car was running and the car studdered and stalled other times. I also noticed by simply moving around the vacuum hose that at times was enough to stall the car as well. When I ran the car without the MAF plugged in it failed to start once and started and stopped another time, and two other times started fine, but RPMs dropped in a choppy way around 100 RPMs at a time and not smoothly.
Any ideas on
1. Is something suppose to be plugged into the electrical outlet thingy on the bottom front of the air filter housing?
2. What is causing the RPMs to fluctuate and the car to studder when slowly accelerating?
#2
Need atleast 10 posts to utilize all functions on here including adding pics. Could be number of things, but that pic will surely narrow it down to the problem. Could be a crack in the filter housing or bad MAF Did you hook up a car scanner to read any codes off it? IF so, list the codes on here and someone will chime in and let you know.
Good Luck.
Good Luck.
#3
#4
#5
Do you mean this connector:
Sorry for the crappy pic. But nothing is plugged into it.
As far as the RPM problem, make SURE the air filter box top is sealed correctly and also look check for vacuum leaks, some of the lines get very brittle and just a bump could crack one. Heres a link to have a look at: https://www.jaguarforums.com/forum/s...-w-pics-52720/
ABS and DSC faults could be a failing battery. Do a seach on "failing battery". If its an original Jaguar battery, I would start there.
Sorry for the crappy pic. But nothing is plugged into it.
As far as the RPM problem, make SURE the air filter box top is sealed correctly and also look check for vacuum leaks, some of the lines get very brittle and just a bump could crack one. Heres a link to have a look at: https://www.jaguarforums.com/forum/s...-w-pics-52720/
ABS and DSC faults could be a failing battery. Do a seach on "failing battery". If its an original Jaguar battery, I would start there.
#6
You should document everything that it takes to fix it because you may have a claim against Valvoline.
You may have multiple vacuum leaks, and inducing a further leak takes it over the limit for running.
And *what* was being hit with the wrench?
In addition, go over every connection that was involved in the ripping out of the airbox+.
It's starting to sound like the only safe thing to do is to instruct oil change places to not touch anything ... just do the oil change. Of course, that can be softened up by saying that it is a specialised procedure ... which it is.
I also noticed by simply moving around the vacuum hose that at times was enough to stall the car as well.
And *what* was being hit with the wrench?
In addition, go over every connection that was involved in the ripping out of the airbox+.
It's starting to sound like the only safe thing to do is to instruct oil change places to not touch anything ... just do the oil change. Of course, that can be softened up by saying that it is a specialised procedure ... which it is.
#7
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#8
Thanks everyone for the replies...
joycesjag yes that is it.
I will get the battery tested too, thanks.
How do I check for vacuum leaks? And is there somewhere to check first that is most likely the vacuum leak is coming from? Do the symptoms seem more like a vacuum leak or a MAF sensor going bad?
Thanks again.
joycesjag yes that is it.
I will get the battery tested too, thanks.
How do I check for vacuum leaks? And is there somewhere to check first that is most likely the vacuum leak is coming from? Do the symptoms seem more like a vacuum leak or a MAF sensor going bad?
Thanks again.
#9
It could be quite a few things, as others have said. One thing is some of the trouble codes you posted do not make sense.
Oh, BTW, welcome neighbor! Well, I say neighbor if the you actually mean Green, Ohio as in the city... LOL
That said, if you need some extra hands, eyes to look at it, let me know...I've got a code scanner as well, just not the fancy, hook it to your laptop one that others have....
Oh, BTW, welcome neighbor! Well, I say neighbor if the you actually mean Green, Ohio as in the city... LOL
That said, if you need some extra hands, eyes to look at it, let me know...I've got a code scanner as well, just not the fancy, hook it to your laptop one that others have....
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cyberpanther (04-10-2011)
#10
Again: be wary about testers - they tend to say "good" but be wrong.
Lots of threads about leaks, so Search
Also this https://www.jaguarforums.com/forum/s...ics-faq-52720/
Lots of threads about leaks, so Search
Also this https://www.jaguarforums.com/forum/s...ics-faq-52720/
#11
https://www.jaguarforums.com/forum/s...ics-faq-52720/
Difficult to say just yet.
#12
The problem...
I noticed the problem about 1-2 days after leaving Valvoline. The car's RPMs would be fine at idle around 750 RPMs but when I was driving around 35 - 45 MPH and slowly accelerating the RPMs would fluctuate or jump up and down 250 RPMs.
Any ideas on
1. Is something suppose to be plugged into the electrical outlet thingy on the bottom front of the air filter housing?
2. What is causing the RPMs to fluctuate and the car to studder when slowly accelerating?
Ouch!
The connector on the air filter box is just a holder for an unused connector on the V6 models.
Cheers,
#13
#14
I'm aware of that condition. Precisely why I added the best way to confirm the converter. Remember, if the converter is locked, the engine is locked to the wheels, basically. The magnitude of the RPM fluctuation seals it for me. I feel 250 RPM is too much for a small vacuum leak.
Cheers,
Cheers,
Last edited by xjrguy; 04-08-2011 at 12:08 PM.
#15
#17
That unused plug is interesting! It looks exactly like the connection on my STR that controls the extra flap to the air box that opens up under full throttle. The 6 cylinder cars don't have this but maybe Jaguar uses the same air box bottom across the S Type line up?
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However she likes her air, when the car is running I can place my hand in front of the air inlet dam and it sucks like a hoover.
#18
Thanks again everyone. I will try to test for a vacuum leak and will post the results tomorrow afternoon.
JOsworth yes please I could use any help I could get as I am a newbie to this whole thing. I cannot PM until 10 posts I believe so how can I get in touch with you. Thanks again. I live like 5 minutes from Akron, and could even meet you or you could stop by my house if you would like just let me know, and thanks again.
JOsworth yes please I could use any help I could get as I am a newbie to this whole thing. I cannot PM until 10 posts I believe so how can I get in touch with you. Thanks again. I live like 5 minutes from Akron, and could even meet you or you could stop by my house if you would like just let me know, and thanks again.
#19
#20
Thanks again everyone. I will try to test for a vacuum leak and will post the results tomorrow afternoon.
JOsworth yes please I could use any help I could get as I am a newbie to this whole thing. I cannot PM until 10 posts I believe so how can I get in touch with you. Thanks again. I live like 5 minutes from Akron, and could even meet you or you could stop by my house if you would like just let me know, and thanks again.
JOsworth yes please I could use any help I could get as I am a newbie to this whole thing. I cannot PM until 10 posts I believe so how can I get in touch with you. Thanks again. I live like 5 minutes from Akron, and could even meet you or you could stop by my house if you would like just let me know, and thanks again.
You just have to promise not to laugh at the fact that I have a Chrysler now... LOL
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cyberpanther (04-10-2011)