I'm new to the forum, I have a beautiful 2007 xkr that sounds like it's misfiring. More likely a rough idle, I have replaced the air mass sensors, the barometric pressure sensor, replaced pcv-valve, replaced all 8 spark plugs-ngk, then 8 Delphi coils. Then 4 oxygen sensors, spent over $2200.00 at a local mechanic, my car still has the check engine light on, still running lean. So frustrating, but I bought this car for $11,000.00 with 85000 miles on it. I just want to get it through Marta and get that check engine light off. Please any help anyone can give to me to get these lean codes off, without going broke, or continue to sit in the garage.

 

What codes are you getting? When was the last time the fuel filter was changed?

 

Yes what codes ?

 

I have no idea when that fuel filter was changed ? I hope the mechanic gap the spark plugs. I was told air mass sensors causing lean codes, also performed smoke test, no vacuum leaks.

 

Dont worry Teddy . the guys on here are fantastic will get you running again

 

I been down for a few weeks now, since I paid that large bill, but I must say I feel better just knowing there is support in getting this beautiful black on black cat running at her full potential, thank you so much for reaching out to me ! God bless you all.

 

Had a look on the web. could be dirty injectors to . try some Techron a bottle in half a tank of gas see if it cleans them

 

Not much sense in guessing here without some basic information. As previously noted, what codes are you throwing?

 

+1.

 

I'll try that George, also I will get the exact codes that are being shown, there's been enough guessing !

 

Your Public Profile shows your location as US. I understand your need for privacy, but if you can be more specific and give us a city or metropolitan area, we may be able to recommend qualified local indy techs who can fix your XKR.

 

Teddy here, I'm in Nashville, bought a bottle of Techron and put it the car, also got all of the codes. I'm curious, I was asked has this car been driven since the repairs? I haven't driven it far, maybe 10 miles. Someone said the car needs to be driven at least 60 miles for computer to reset itself ? Is this true? Here are the codes--( po300-thru-po308-cylinder1-thru-cylinder8-misfire detected. Next-po316-misfire detected in startup (first1000 revolutions)-po174-system too lean(bank 1)- po101-mass or -volume air flow circuit range/lerformance--po2105-throttle actuator control system-force engine shutdown.Should this car be driven on the interstate if it's misfiring ? I hope this information is helpful !

 

DO NOT DRIVE IT! "Force Engine Shutdown" is a huge hint to not drive!
It sounds somewhat like a large vacuum leak. Maybe a jumped chain?
OK, now I'm just spitballing........

 

You need to check the catalytic converter.

 

The catalytic converter have been replaced this summer.

 

With an aftermarket one?

 

My moneys on injectors

 

If DTC P0300 is present accompanied by random misfires on all cylinders, the very first thing to do is check fuel pressure. Under no circumstances is the vehicle to be operated under conditions that cause the MIL to flash as catalyst damage is occurring.

If you don't already have it, here is a link to the X150 Workshop Manual:

https://www.dropbox.com/sh/gn6p1upuh...S531fLxta?dl=0

Refer to the Manual for the fuel pressure test procedure.

What is the age of the battery? The battery must have a minimum of 12.6 volts when checked across the terminals with a voltmeter whilst the ignition is in the OFF position. If the voltage is less than 12.6 volts, charge the battery for at least 8 hours between 2 and 5 amps then perform another test. If the voltage is still less than 12.6 volts the battery must be replaced. A failing or weak battery is the often the cause of random DTCs and other electrical 'gremlins' chased on these forums.

 

I would agree with fuel pressure test. Replace the filter then test again. Note any difference in pressure before and after the filter change.

Since you did all that other work, the fuel system would be suspect...

 

I replaced the battery 3 months ago, I will replace the fuel filter, is it safe for the car to run to circulate the injector cleaner, and if it is, how long should I let it run?