Blk94BroncoXLT
New member
Hello, new guy here, 1st post...
I recently purchased a 94 Bronco XLT with the 5.8L, auto, 33 gal tank and manual hubs. It has 58k original miles and is like new. Since purchase 5 months ago, ALL fluids, hoses, belt, plugs (platinum in same heat range), PCV valve, air filters, wires, rotor and cap have been flushed/changed. Everything looked well actually, but I did it more for reassurance. The only mod is a Flowmaster muffler.
Since purchase, I've gotten 16mpg on the highway and about 10mpg around town. She starts, runs and idles perfectly. Not a leak, squeak, rattle or noise. Original AC is ice cold. Start idle is about 1100 rpm's & drops down to between 600 & 700 rpm's in a minute or so and stays perfectly level. My oil pressure remains constant between the "M" & "A" and Water Temp between "N" & "O" once warmed up. No CEL's since I've had her.
My ONLY issue so far is that once the engine is warmed up, it pings occassionally (sometimes soft, sometimes loud)during either slight acceleration from a dead stop or when accelerating slightly in OD when the truck doesn't downshift to 3rd automatically. When this pinging occurs, I get a slight puff of greyish smoke from the exhaust which otherwise is crystal clear.
The pinging goes away if I give it less (granny accelerate) or more (aggressive accelerate) gas. The loudness of the ping does decrease a bit if I shift to all 93. If I use a full tank of 93 Octane and 2 bottles of STP Octane boost, the pinging goes away completely. I've been up and down the east coast and have filled up in almost every state from CT to GA, no difference. The original plugs looked awesome when I removed them and the oil always looks great.
I realize my truck may be tuned from the factory to run lean and maximize MPG's, so I was curious if it is normal for this engine to ping under slight acceleration (like the owner's manual says)? If not, what else should I be looking for?
Thanks for the help!
I recently purchased a 94 Bronco XLT with the 5.8L, auto, 33 gal tank and manual hubs. It has 58k original miles and is like new. Since purchase 5 months ago, ALL fluids, hoses, belt, plugs (platinum in same heat range), PCV valve, air filters, wires, rotor and cap have been flushed/changed. Everything looked well actually, but I did it more for reassurance. The only mod is a Flowmaster muffler.
Since purchase, I've gotten 16mpg on the highway and about 10mpg around town. She starts, runs and idles perfectly. Not a leak, squeak, rattle or noise. Original AC is ice cold. Start idle is about 1100 rpm's & drops down to between 600 & 700 rpm's in a minute or so and stays perfectly level. My oil pressure remains constant between the "M" & "A" and Water Temp between "N" & "O" once warmed up. No CEL's since I've had her.
My ONLY issue so far is that once the engine is warmed up, it pings occassionally (sometimes soft, sometimes loud)during either slight acceleration from a dead stop or when accelerating slightly in OD when the truck doesn't downshift to 3rd automatically. When this pinging occurs, I get a slight puff of greyish smoke from the exhaust which otherwise is crystal clear.
The pinging goes away if I give it less (granny accelerate) or more (aggressive accelerate) gas. The loudness of the ping does decrease a bit if I shift to all 93. If I use a full tank of 93 Octane and 2 bottles of STP Octane boost, the pinging goes away completely. I've been up and down the east coast and have filled up in almost every state from CT to GA, no difference. The original plugs looked awesome when I removed them and the oil always looks great.
I realize my truck may be tuned from the factory to run lean and maximize MPG's, so I was curious if it is normal for this engine to ping under slight acceleration (like the owner's manual says)? If not, what else should I be looking for?
Thanks for the help!