Pinging in 91' Help!

[ExploderBlues]

91' pinging.....doe's this model year have a knock sensor, and if so, where is it located? Does it more in overdrive, as opposed to Drive, but still does it and more when going up a hill or into strong headwind. Between 55 and 75 miles per hour, any suggestions?

 

[88vert]

Your lower intake bolts probaly need retorqued.Do a search there is tons of info on this subject

 

[KevinK]

Is the pinging the same as "rattling" valves under acceleration?

Thanks,

KevinK
'91 XLT

 

[Rhett]

91's don't have the knock sensor. I think that was added starting in 95. Re-torqueing the lower manifold bolts can fix it sometimes. Last time I tried re-torquing them I had trouble getting to all the bolts (you'll need extensions etc). You might also clean your MAF sensor. Do a search on that, and there is also a write-up with nice pictures on how to clean the MAF here as well.