'88 Ranger - 4 cyl - Running Rough/Missing
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'88 Ranger - 4 cyl - Running Rough/Missing
Truck belongs to my cousin...has 124k miles on it...Ran fine till the other day. Was going down the road then all of a sudden it lost power and starting knocking pretty bad is what he described. Was able to very slowly limp it home. I went over there today and looked at it...Oil looks good, no coolant in it. Started it and it didn't knock at all but idled VERY rough. After running for about 5 minutes I felt the exhaust manifold...Rear two cylinders felt very hot, the front two were not nearly as hot, I could actually hold my hand without getting burning on the front two, like they were not firing.
Pulled the spark plugs at those two cylinders and they were somewhat black and a little oily. Replaced with new plugs and started it back up...NO change. Distributer was tight and all wires appeard to be fine. Wires and plugs all changed about 2 years ago.
Also, exhaust sounded weird...Like a "bom bom bom bom bom" coming out of the exhaust, definitely sounded like a miss to me.
One thing I did notice was as I raised the RPM it seemed to smooth out.
Does not seem to be using much oil or anything. No real excessive smoke coming out of the tailpipe.
Any ideas???
Pulled the spark plugs at those two cylinders and they were somewhat black and a little oily. Replaced with new plugs and started it back up...NO change. Distributer was tight and all wires appeard to be fine. Wires and plugs all changed about 2 years ago.
Also, exhaust sounded weird...Like a "bom bom bom bom bom" coming out of the exhaust, definitely sounded like a miss to me.
One thing I did notice was as I raised the RPM it seemed to smooth out.
Does not seem to be using much oil or anything. No real excessive smoke coming out of the tailpipe.
Any ideas???
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Joined: Feb 2004
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From: new braunfels ,tx
Im not sure what the PSI should be, might be in a technical sticky im thinking around 40 to 50 psi but thats a guess. There is a shraeder valve on the fuel rail by the intake. It looks like a air valve similar to a tube on a bicycle/car tire. There could be a cap on it, but on mine there is not. You can press the valve with a screwdriver just to see if there is any pressure (caution fuel under pressure) but you would need a tool and attachment to get a measurement on it. Im guessing if the other cylinders are firing you have fuel but worth checking. I would stick with the spark and timing 1st.
You could change the fuel filter if it has never been done, its cheap and couldnt hurt.
You could change the fuel filter if it has never been done, its cheap and couldnt hurt.
