Have a 2003 S Type. My garage guy told me today I have electronic gas pedal problems. Has anyone else had this happen?

 

Could you be a little more specific? What makes them think you have a problem? If you have restricted performance or failsafe issues what are the OBDII codes?

 

Hate when that happens....


But really, what are the problems? Yes it is drive by wire for the throttle, but it should at least throw a code I would think

 

My car experienced symptoms and they only happen when I'm on the gas. After first starting up and as I accelerate the rpms will surge up and down causing acceleration problems. Also had a no go twice in one week, but as I pulled to the side of the road the car hadn't died it was just idling. turned it off and back on, then made it to work. Garage guy tracked this down to the gas pedal when we told him it was probably the fuel pump when we took it in. I had the car coded twice before the garage and always got P1111 the typical pass code for "all clear". The garage has jag specific equipment and after tracing to the trottle body and gas pedal figured the trottle body needed cleaned and the gas pedal reading showed faulty. Never had a check engine light. When it did "no go" the warning was system fault and it would go away when I restarted the car. Just got the car in february and it has always had issues w acceleration since I got it. First things we did to it was a fuel filter, air filter and new serpentine belt. But it never helped the issue. Hopefully the garage has found the issue. Hope this helps others in a quandry as to "what the (bleep) is going on?" And thanks to everyone for the welcomes!

 

Sounds like you need to start with the #1 cause for such issues- a bad battery.

 

No kiddin? that can be caused by a bad battery?? Because its not recieving enough power?

 

The car HAS always started a little hard to. I'll call the garage in the morning and tell them to check the battery. Thanks man, that was great thinkin

 

Yes it's a bit weird because there are at least a half a dozen codes just for the gas pedal and at least that many for the throttle body. They should have stayed in memory if real.

Can you post how old the battery is?

Be aware that checking it might not be enough. Post back how old it is. Since the battery is in the trunk they last a long time. Like 7-10 years! I replaced my factory battery last year at 7.5 years just because I felt it had done it's duty and was only $110 to swap out. Cheap compared to any repair bill!

One last thing. Check your trunk and battery to make sure you have no moisture in the bottom of the spare tire area. That can cause all kinds of stuff!
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Well not really sure how old it is, probably the factory battery tho. Was seriously grandma owned previously, never had much of anything done to it. The car is at the garage right now so I'm unable to go out and check it. But lets assume it is the original and the car is a 2003

 

It would easily be on it's second if not third battery.

 

If the pedal has a fault you get code(s) because it has extra sensors to cross-check. Same is true of the throttle. Your guy is looking in the wrong places so far.

Battery is far and away #1 suspect. Else power problem like bad ground.

The main time you don't get codes is when it's so confused it simply has no idea wtf is happening. Commonly no P1111 then.

 

ok update from my garage guy. I asked about codes. He said he did obtain a code for the gas pedal assem and feels it was on its way out. After replacing the assem, he test drove it and there is still a flucuation of the rpms starting around 45mph, but once the car warmed up a bit he couldn't get it to act up. I ask him about the battery which he confirmed as the original and had tested it and it checked out good. He did mention that he noticed it started a little hard as I'd explained to him, but still felt this was not the issue at hand. He has a call into a tech guy in the next big city over, he's concerned that it maybe the torque converter and wants to find out if he were to flush the tranny if it would remedy the problem. That's where we're at

 

The RPM fluctuation at 45 mph while cold is a very well known issue. Sounds like your mechanic should join up here and learn something about S-types instead of taking your money.

TSB S307-14 covers this issue fully.

https://www.jaguarforums.com/forum/a...sion-surge-pdf


And your battery is still suspect- they always 'test good' right up to when they leave you stranded.

 

Well, to be fair he's not utterly wrong so that's a plus over many mechanics who don't really know these cars!

If it is indeed the TC you might get years more use out of it...

 

Got my car back today, garage guy is still concerned about the surging problem. My gas pedal feels great. I really couldn't get the car to act up while driving home. it doesn't really surge when its warmed up. My garage guy still wants to have a tech guy look at it in the next couple of weeks. Tech guy says the TCM can be reprogrammed to solve this problem. Would be under $200, thats cheaper than a torque converter. At pickup the garage guy gave me a copy of a tech bulletin issued by jaguar stating the issue and the fix. basic plug in and reprogramming w estimated time of 15 mins. this report is dated 05/03. Also battery update, since i got the car back I checked the battery. The battery is a Jag and was manufatured 08/12. So right now I think the battery is good and it did test good. Also told my garage guy about the forum and he has now been on here. Thanks to EVERYONE for all your input and help!!!

 

The TSB to reflash it is on here and works for many people but not all. Worth trying, I reckon. Just don't be devastated if it makes no difference because sometimes that's what happens (I suppose it's probably then the TC).

 

Have the coils been tested? One or more could be acting up - however, look at the battery first (load test) or possibly the TQ - both mentioned a few times already...