My mechanic did an engine vacum to take out deposits & changed fuel filter. It still pings. Now they say I have to take to dealership to have computer reset or more diagnostics. Their diagnostic codes don't go further. GMC 1995 Jeep Grand Cherokee. Any suggestions? Does this sound right?
2006-12-21 15:14:14 · 12 answers · asked by nursetobe 2 in Cars & Transportation ➔ Maintenance & Repairs
somtimes there are updates to the computer to improve diveability. you might check other shops if they have the ability to reflash the computer if not you have to go to the dealer.
2006-12-21 15:35:23 · answer #1 · answered by Kristine H 2 · 0⤊ 0⤋
If your mechanic did a "engine vacuum to take out (carbon) deposits"-you've been ripped off! Period!!! There is no such thing! Period!!!
The fuel filter has nothing to do with an engine pinging! Period!!!
Did anybody bother to check the "knock"sensor?
I hate to tell you this but you've been ripped off! Sorry about that!
Oh by the way,when did GMC start making a Jeep?
2006-12-22 02:39:14 · answer #2 · answered by gittit 3 · 0⤊ 0⤋
Using a higher grade gas will help a little. The grade of gas is NOT a quality scale, it has to do with its detonation characteristics (pinging). If you could get your hands on some aviation grade 100 LL, that would be the best! I think sunoco has 103 octane, try that.
Try changing your spark plugs, they may have the deposits that are acting like glow plugs, causing the pre-ignition. Also, it might be the cooling system (thermostat?) spark too advanced? Watch that TEMP Gage!
2006-12-21 15:32:02 · answer #3 · answered by Steve-o 3 · 0⤊ 0⤋
I agree with Dodge Man. This sounds like a common case of the ignition timing being off causing pre-detination usually this occurs
when the vehicle is under load and at operating temperature. You
can always try a fuel octane upgrade first, I always start with the cheaper fixes and work my way up.
2006-12-21 16:00:46 · answer #4 · answered by akastryker 1 · 0⤊ 0⤋
well if its a 95 or newer could be the gas you use ,try a full tank of 93 octane plus a bottle of octane booster and see what happens some times cheap gas from lets say sunoco, big gas company for cheap gas that makes cars ping ,if you use this gas every day it will screw with you motor ,so like i said try that first its cheaper then getting your codes rest.plus youl feel a big difference with the better gas
2006-12-21 15:20:54 · answer #5 · answered by shane p 1 · 0⤊ 0⤋
It sounds to me like a case of lack of proper octane.What gas do you use. Try a 91 or a 93 for a couple of tank fills and I am sure you will note the difference.
2006-12-21 15:19:35 · answer #6 · answered by Ted 6 · 0⤊ 0⤋
If your car ever had the head plained after an oil leak, this raises the compression ratio, which requires a higher octane of gas.
2006-12-21 16:48:04 · answer #7 · answered by David W 1 · 0⤊ 0⤋
i own a repair shop,and this is caused by slow timing on it,,did they check this,,i bet not,,if its out of time it will sound like its full of loose gravels when you start up a hill or accelerate it,,have it timed,,this should take care of it,,also have them check the slack in the timing chain,,this can be dome by watching the rotor button to see how much it moves when the engine is turned over by hand,,good luck hope this help,s.,,have a good x-mas.
2006-12-21 15:33:57 · answer #8 · answered by dodge man 7 · 0⤊ 0⤋
Sometimes you need to floor it and run it up to max RPM. This helps get the carbon out. I've heard of old ladies who never get their car above a few thousand rpm and and causes buildup problems.
2006-12-21 15:20:42 · answer #9 · answered by Need Flow 2 · 0⤊ 0⤋
sounds like it needs a timing light on it,and maybe your using too lower octane gas.
2006-12-21 16:54:44 · answer #10 · answered by Anonymous · 0⤊ 0⤋