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Why does a 1994 Ford Ranger XLT ping when using regular unleaded gasoline?
Littleranger
I found this by doing a Google search:
I have a 94 Ranger 4x4 XLT I bought with 2.7 miles. It too acquired the engine knock problem (4.0L). I learned that this motor is prone to carbon deposit buildups, and Ford has a TSB to deal with this. I found this online from a co called Alldata, sorry, I don't have the URL. I'll repeat it here.
1. Use Motorcraft Carburetor tune up cleaner PM-3. You'll need 3 cans, cost me $20.
2. Carbon removal:
a. Disconnect canister purge line from throttle body.
B. attach a vacuum line to the canister purge port (about 2 feet is needed).
C. At hot idle, allow the engine to ingest 1/2 to 2/3 of a can of the cleaner. Use caution not to ingest too quickly due to potential hydro-lock issues.
D. shut engine off and allow it to soak for one hour.
E. start engine, allow to ingest the remainder of the can of tune up carb cleaner.
F. remove vacuum line and re-install canister purge line.
G. road test vehicle at 3500rpm for 2-3 miles. I drove at 3000 rpm or so for about 7 miles on the highway, and had engine good and warm.
H. repeat the above procedure two more times for a total of three times total.
I. change oil and filter. They forgot to tell ya to change plugs too, so have them ready to install AFTER this process is done.
They go on to tell you to have daily periods of operation above 3000RPM; I don't fully agree, but do rev it a bit now and then. Also, use regular gas, not mid-grade or super unleaded as they INCREASE the probability of carbon buildup.
I did this in the summer of 02 with 140,000 miles, and it definitely fixed the problem 100%. Also, make sure that your MAF sensor is clean, as this has been known to cause engine knock on the 4.0L engine. My experience shows that gas additives, while they may hide the problem, are temporary and expensive.
Hopefully this is the last time anyone will have to wonder how to fix this problem again. Addtl info-----Dealer coding: basic part #6108, condition code 42. Ford OASIS CODES: 497000, 615000,702000, and 702100, in case someone needs to know more.
So there you goPhil
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∙ 12y ago
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