x300 starting problems
#1
x300 starting problems
Hi Guys, need abit of guidance here please. Have just changed the spark plugs on my 3.2 jag, all good started ok. Then decided to clean the throttle body. stripped cleaned ,also cleaned the air filter assembly,refitted now she turns over fires but wont pick up!! Removed the air flow meter and started the car but not running too well, then whilst running refitted the airflow and air filter assembly , car kept running but soon as turned off would not start again. Unfortunately cannot get into my local indie till next week(fully Booked) so stuck with a car that wont go , suggestions please!
#2
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#4
Join Date: Feb 2014
Location: Crossroads of America
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Have just changed the spark plugs on my 3.2 jag, all good started ok. Then decided to clean the throttle body. stripped cleaned ,also cleaned the air filter assembly,refitted now she turns over fires but wont pick up!! Removed the air flow meter and started the car but not running too well, then whilst running refitted the airflow and air filter assembly , car kept running but soon as turned off would not start again.
Hi bigriz,
One possibility that comes to mind is either contamination of, or misadjustment of, the Throttle Position Sensor, which is mounted to the throttle body (TB). When you stripped and cleaned the TB, did you disconnect the TPS from the TB? If so, is it possible that it was not reinstalled in exactly the same position?
Is it possible that whatever cleaning fluid you used to clean the TB may have contaminated the TPS or its electrical connector?
What about the Idle Air Control Valve and its electrical connector?
Did you by chance disconnect the O2 sensor electrical connectors? If so, is it possible you inadvertently swapped the connectors for two or more sensors?
Have you scanned the system for any stored Diagnostic Trouble Codes (DTCs)? The kinds of symptoms you describe are likely to have triggered at least one code.
Please keep us informed.
Cheers,
Don
Last edited by Don B; 10-03-2014 at 10:29 PM.
The following users liked this post:
MountainMan (10-04-2014)
#5
thanks for the reply Don, have taken the car down to the local garage, they have managed to get the car started but it seems to be over fueling. Apparently no codes have come up on his scanner. They have closed for the weekend so will have no further joy until monday. Wonder if i have made an error in not waiting till the euro specialist garage was available!!!!
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Hi bigriz,
Without a fault code to indicate a problem with the Mass Air Flow sensor (MAFS) or its circuit, it sounds like the garage is just guessing. If so, that is a very expensive way to diagnose malfunctions...
You mentioned "over fueling" in your previous post. If you mean the engine is running rich, the O2 sensors and Coolant Temperature Sensor should also be checked. Also, if the diaphragm in the Fuel Pressure Regulator fails, raw unmetered fuel is inhaled directly into the intake manifold via the FPR's vacuum hose, causing rich running that the ECM can't correct.
Cheers,
Don
The following 2 users liked this post by Don B:
MountainMan (10-09-2014),
RJ237 (10-08-2014)
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#8
thanks for the reply Don.Got the call from the garage, car ready to pick up, all good apart from a very slight missfire. Great i thought, pays my money ,jump in the car starts and gets me to the fuel pump (approx 20 metres) and stalls! Put in petrol showing empty,startup and drive away and stalls in the middle of the road!! Started again drove round the corner back to the garage and stalled again.Left with them!! Apparently checked fuel pressure, injector spray pattern,removed throttle body for correct throttle positionsensor fitment &adjustment,checked ecu all good apparently,fitted another air flow meter and here we are at status quo.!!
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