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Maybe consider cleaning the MAF sensor, especially if your using one of those oiled cotton gauze, or foam type air filters.
If any of the codes were for a lean mixture,
look for loose, cracked, split, or missing vacuum lines & this would include the PCV's manafold vacuum line & the evap canister lines , a misbehaving stuck open PCV valve, or leaking HVAC vacuum lines.
Leaking intake manafold gasket.
Wrong heat range spark plugs.
A performance chip, thats advaned the timing too far.
Bad gas maybe.
How long have you been using higher octane fuel????
Did this "ping" problem begin slowly, over time, or suddenly, after some event????
I cleaned the MAF sensor when I changed the IAC, I disconnected battery and have not had Check Engine light on since then, so I never even looked at the codes.
Using standard Air Filter, FRAM, New.
No chip, totally stock.
Spark plugs need changed probably, I changed the 3 on drivers side (Autolite DPP) but could not get to the other 3, I probably need to stop being lazy and get to those.
Only used 1 tank of mid grade and 1 tank of premium, 87 octane since then.
I got the car in February with 58k on it, now at 70k and has always pinged.
Next steps are replace all 6 plugs, then look for vacuum lines and replace PCV, then report back?
So it's always pinged since you bought it back in Feb.
Another thing we didn't consider was combustion chamber carbon deposits, but you said it hasn't responded to an increase in octane, & most ping problems do.
Is the ping problem worse under load????
If not, I'd wonder if it's a detonation problem & maybe it's the dreaded OHC cam chain casset rattle, thats said to sound just like detonation ping. There is a TSB for that problem.
I've been dealing with pinging problem forever, I did everything you can imaging, cleaned and replace sensors , spark plugs, seafoam twice you name it, and nothing can completely get rid of the detonation, mine is not bad but I can hear the ping on and off
changed fuel brand that didn't work either, the only way I can get rid of the pinging is by changing to a higher octane 89 or higher, 87 can't cut the cheese!
I thing these Rangers after a few thousand miles they will ping and there's nothing you can do. After expending some good bills on sensors and repairs, I'm back to step one!
Last edited by cadriver; Aug 13, 2007 at 09:30 PM.
holy crap, I'm not the only one then....i've got a 01 3.0l edge, posted on a spark knock problem on here before, thought I had it figured, but apparently not....i took it to the dealer last week and spent over 400 for them to tell me they couldn't hear any knock or pinging and to use Shell or Mobil gas....and that's the only gas I use...so i'm officially over the dealer...it did react to a higher octane gas, and seems to knock more when the engine is warm, so i checked the plugs, good, proper heat range, MAF is clean, no hose cracks or leaks, updated PCM, changed the thermostat from a stock 197 to a 160, still no good.....going to add some sea foam or PM-3 per ford tsb....if that doesn't work, I'm ripping heads off and going to check the pistons to see if they are heavily carboned up and clean by hand, replace all gaskets and valves and see if there is any wear on the pistons from this knock....if that doesn't work, i'm driving this thing off a cliff....I want to add headers, cai, and a catback, but am afraid to do that when I still have this knock....
mcsmokes, running a 160 deg thermostat is going to confuse the computer about when to go into open loop operation, as it's set up to operate the engine at 195F.
If it senses the engine is colder than it's supposed to be, then it'll keep the air fuel mixture richer longer & that with using higher octane fuel, will exacerbate combustion chamber carbon deposits & that sure won't do your ping problem any good.
Won't help the lube system either, as the oils add pack & the oil's viscosity at temperature, is designed for the engine temp to be greater than 190F.
I know what you were thinking, maybe the engine was too hot & causing the ping, so run it cooler, well thats not a good idea nowdays, as you'll cause more problems.
Imo I'd put the 195 thermostat back in & look to a good decarbon process, and maybe a cooler spark plug.
good point, I may do that....my buddy who's helping me on the problem talked to a guy who's an engineer at autolite and he said they don't make a heat range colder spark plug for the one's i got in there, so i shot that idea down....but yea, I was thinking if the engine pings more when it's warmed up, if I throw a lower thermostat in there it may help, but it obviously doesn't...so I may throw the 195 back in
If for any reason the timing belt was changed, and the reluctor sprocket on the crankshaft pulley got slightly damaged/dinged this will cause a interference signal from the crankshaft sensor to the PCM. The truck will ping constantly under acceleration. The lugs on the sprocket and the valleys must be in perfect condition.
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