97 XK8
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From: Pittsburgh, Pa.
97 XK8
Will not rev past 3000RPM. Cleaned throttle body & mass air flow. Replaced camshaft position sensor, crank position sensor, and both knock sensors as well as timing chains, chain tensioners & guides. Any ideas?
Joined: Dec 2011
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From: Durham, UK
Welcome to the forum psorco,
I've moved your question from Jaguar Forums Feedback & Suggestion Centre to XK8/XKR forum. The Feedback & Suggestion Centre is for posts about the forum and not for technical questions. Members here with the same model will be able to help.
Please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST forum and post some information about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice about posting to the forum.
Graham
I've moved your question from Jaguar Forums Feedback & Suggestion Centre to XK8/XKR forum. The Feedback & Suggestion Centre is for posts about the forum and not for technical questions. Members here with the same model will be able to help.
Please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST forum and post some information about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice about posting to the forum.
Graham
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From: Pittsburgh, Pa.
Thank you RJ237.
Re: 97 XK8 4.0 engine.
Attempted to take it for a run. Very weak performance. Barely made it out of the garage. Any other suggestions?
By the way, failed to mention that all coils & plugs were also replaced.
Re: 97 XK8 4.0 engine.
Attempted to take it for a run. Very weak performance. Barely made it out of the garage. Any other suggestions?
By the way, failed to mention that all coils & plugs were also replaced.
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Joined: Feb 2018
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From: Pittsburgh, Pa.
Thanks again for your response. Cable is nice & tight. Although camshaft position sensor has been replaced, I am getting a P0340 code which is camshaft position sensor. Is it possible that new sensor is faulty? Engine idles & runs smooth. But, begins to cut out at 3000 RPM. Will faulty sensor limit RPM?
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Perhaps a little more history.
Did you have any issues prior to replacing the tensioners, etc.?
Did you replace the sensors as part of tracking down this issue?
P0340 can be a faulty sensor, but I'd also check the wiring & connectors feeding it for open/short circuit. Try swapping back the original CPS to see if that helps.
If the electronics can't see the cam position I wouldn't expect it to run fully 'on song'
The second time the code is thrown the Check Engine light should appear. I believe (others will chime in here if I'm wrong) that the engine RPM is limited in this event.
Did you have any issues prior to replacing the tensioners, etc.?
Did you replace the sensors as part of tracking down this issue?
P0340 can be a faulty sensor, but I'd also check the wiring & connectors feeding it for open/short circuit. Try swapping back the original CPS to see if that helps.
If the electronics can't see the cam position I wouldn't expect it to run fully 'on song'
The second time the code is thrown the Check Engine light should appear. I believe (others will chime in here if I'm wrong) that the engine RPM is limited in this event.
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From: Pittsburgh, Pa.
I did have lack of performance issues. Did some research & cleaned throttle body & MAF. Then checked for codes. Got ABS, Tract control, & coil codes. Sent ABS module out for repair & replaced coils & plugs. Then got Cam & Crank position sensor codes. Replaced both. After these repairs vehicle started & ran smoothly until hit 3000 RPM. Checked for codes again & got Knock sensor codes. Researched Knock sensor issues & found that plastic chain tensioners could trigger Knock sensors. Replaced chains, tensioners & guides as well as water pump & plastic thermostat housing. Also replaced Knock sensors. Will replace fuel filter. Many thanks to all for your help. Will keep you posted. Thanks again!
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