XK8 Engine Stutter
#1
![Default](/forum/images/icons/icon1.gif)
I have a 2005 Jaguar XK8 4.2L engine with less than 75,00 miles.
Recently, the car has developed a stutter and bogs down on acceleration yet does not throw a DTC.
I am thinking this is the result of a faulty / failing throttle position sensor (TPS).
I plan to clean the throttle body, the TPS connector, and install a new sensor.
Any further insight from other owners/mechanics?
Earlier in the year, I replaced the air filter, fuel filter, MAF, and all spark plugs (regular maintenance).
I also replaced the upper O2 sensors based on "bank 2 running lean" DTC which resolved that issue.
I have had no other issues with the car for about three months until this stuttering problem.
Recently, the car has developed a stutter and bogs down on acceleration yet does not throw a DTC.
I am thinking this is the result of a faulty / failing throttle position sensor (TPS).
I plan to clean the throttle body, the TPS connector, and install a new sensor.
Any further insight from other owners/mechanics?
Earlier in the year, I replaced the air filter, fuel filter, MAF, and all spark plugs (regular maintenance).
I also replaced the upper O2 sensors based on "bank 2 running lean" DTC which resolved that issue.
I have had no other issues with the car for about three months until this stuttering problem.
#2
![Default](/forum/images/icons/icon1.gif)
You can usually check the TPS operation without the engine running using the live data option on a code reader. You might be able to rule that in or out.
Dirty or sticking injectors often do not generate a fault code whereas ignition problems usually do. As well as throttle body cleaning, perhaps worth a tank full of premium fuel plus good quality injector cleaner to see if that makes any difference.
Richard
Dirty or sticking injectors often do not generate a fault code whereas ignition problems usually do. As well as throttle body cleaning, perhaps worth a tank full of premium fuel plus good quality injector cleaner to see if that makes any difference.
Richard
#3
![Default](/forum/images/icons/icon1.gif)
Unfortunately, I don't have a live data code reader. Also, I haven't yet found a mechanic that I can trust and the Jag dealer near me starts at $160 per hour for diagnostics alone.
Since a TPS is easily replaced and low cost, I thought I'd start there.
Fuel injectors are darned expensive (approximately $200 per and there are 8 of them!). The Jag dealer gave me a quote of $2,600 to replace them all. I can do the job myself but still, parts cost is very high. Has anyone used an injector cleaning service they would recommend?
Note: I only use premium gasoline and have twice recently used a good quality injector cleaner. The car had been running great for that past few months until this stuttering issue.
Since a TPS is easily replaced and low cost, I thought I'd start there.
Fuel injectors are darned expensive (approximately $200 per and there are 8 of them!). The Jag dealer gave me a quote of $2,600 to replace them all. I can do the job myself but still, parts cost is very high. Has anyone used an injector cleaning service they would recommend?
Note: I only use premium gasoline and have twice recently used a good quality injector cleaner. The car had been running great for that past few months until this stuttering issue.
#6
Join Date: Apr 2014
Location: Jersey, Channel Islands
Posts: 4,172
Received 2,400 Likes
on
1,556 Posts
Thread
Thread Starter
Forum
Replies
Last Post
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)