Hi. Can anybody offer some suggestions on what I can do for my problem so I don't have to bring it to a Jaguar service shop and get hammered financially.
My car stalls occasionally (hot or cold engine) when slowing down to a Stop Light or just cruising very slowly in the office garage looking for parking space. It used to occur very rarely (like once a month), now it's happening 5x/week. Any suggestions? The spark plugs were changed at 78,000 miles. Odometer now has 97,000 miles. when I got the car used at 78,000 miles, i also had the fuel filter, air filter, Mass Flow Sensor, 0xygen sensors, one of the cat replaced and I put STP super concentrated fuel injector cleaners every other full tank refill.I tried opening the hood to listen for air leaks as I heard/read that the plastic hoses/tubes in the engine area eventually leaks due to high heat in the engine area. Not so much the rubber hoses. I don't hear any hisses or leaks. Anybody?

 

You're not likely that way to find the leak that is the #1 suspect.

Serious hunting for cracks/splits/etc (probably small) is worthwhile and try looking at fuel trims as it may show up there.

 

Thank you for your suggestion. Where would the fuel trims be located at? Thanks.

 

is it throwing any codes on the MIL at all?

 

Hi philc850,

First of all, it will help us if you tell us the year, model and engine of your car. It's a great idea to add this info to your signature line so others don't have to ask.

As trosty suggests, it would be worth having your car scanned for any stored Diagnostic Trouble Codes (DTCs), commonly called "fault codes," which may or may not illuminate the Check Engine Light (CEL) or Malfunction Indicator Lamp (MIL). Many of the Powertrain (P) codes can be read by a generic OBDII scanner for free at most local auto parts stores. However, many of the codes are proprietary to Jaguar and can only be read by special systems, either at the dealer or at a good independent Jaguar specialist with the necessary equipment. If any codes are stored they may help narrow down your diagnostic process.

I'll let JagV8 explain fuel trims, but you won't "find them" on the car, they are stored in the Engine Control Module (ECM) and read with a scanner or diagnostic system.

I would suggest that you raise your car and have a careful look for leaks around the transmission pan, especially around the electrical connector sleeve. Low transmission fluid is one potential cause of engine bogging and stalling at low speeds. I haven't heard of this happening on an X350, but it was a known issue on earlier Jaguars with ZF transmissions.

Also, STP recommends that its Super Concentrated Fuel Injector Cleaner be used at every oil change or every 4,000 miles. STP states that their additives "will not harm the fuel systems or O2 sensors when used as directed." They do not make the same claim if the product is used more frequently than directed.

Cheers,

Don

 

Read with OBD tool with live data. Use Search for more info on fuel trims.