engine pinging

by **haomap** » Tue Jun 21, 2011 8:07 pm

Hey guys my 2.5L 2007 model liberty is experiencing some engine pinging.
I'm using BP ultimate 98 petrol. ive tried using all other petrols
however I get an even louder pinging noise. any suggestions as to what I can
do ?

thanks for your help

by **Dropz** » Wed Jun 22, 2011 9:40 pm

Take it to a workshop and ask them to check the operation of the knock sensor, the timing advance, and for any codes. If nothing seems to be wrong reset the ecu memory just in case.

Can also check things like the plug gap may be too small causing it to spark early.

by **haomap** » Thu Jun 23, 2011 1:04 am

I'm pretty sure it wouldn't be the timing advance cause there is no
dizzy. the liberty has coil packs so theres nothing to adjust there.
I will try and reset the ecu tomorrow by disconnecting the battery.
see how that goes.

by **Dropz** » Thu Jun 23, 2011 8:03 am

Timing is controlled automatically and if the timing belt is out a tooth or two then it can mess with the timing.

by **Ben** » Thu Jun 23, 2011 8:39 am

haomap wrote:I will try and reset the ecu tomorrow by disconnecting the battery.
see how that goes.

That will clear the fault codes and you'll potentially be back to square one, not knowing what's going on. Check the codes, then reset if you can.

by **haomap** » Thu Jun 23, 2011 11:46 am

what do you mean by check the codes. ? from the ecu?

by **Dropz** » Thu Jun 23, 2011 5:51 pm

Yes, you need an OBD2 scanner tool of sorts. you can grab them cheap off eBay, or as stated, go to a workshop and ask them to check it for you.

by **tangcla** » Thu Jun 23, 2011 7:13 pm

Ben wrote:That will clear the fault codes and you'll potentially be back to square one, not knowing what's going on. Check the codes, then reset if you can.

Thanks for the reminder - I need to do that on my car later too!

by **haomap** » Fri Jun 24, 2011 11:39 pm

Dropz wrote:Yes, you need an OBD2 scanner tool of sorts. you can grab them cheap off eBay, or as stated, go to a workshop and ask them to check it for you.

there is no engine light error so there is nothing to scan? you are only able to scan if the engine light is on is it not? correct me if im wrong

by **Dropz** » Sat Jun 25, 2011 9:35 am

IF the engine light has come on at some stage, you can check. The Onboard Diagnostics System will do what it can to resolve the issue, but it's always good to check the codes.

by **west_minist** » Sat Sep 03, 2011 10:56 am

Post a log.

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