1988 Ranger Skipping

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1988 Ranger Skipping

Postby gdaddy » Fri Aug 14, 2015 12:58 pm

I am new to this board. Just recently purchased a Picoscope. I have a 1988 Ford Ranger 2.9 that has a skip on cylinders 1 and 4. Other shops have replaced the usual things...plugs, wires, even the distributor. I have performed a compression check [OK], removed valve covers to inspect valve components [all OK] and I have tried to perform a cylinder pressure test with the Pico {cylinders 1 and 4 are a little lower that the others]. We removed the cylinder heads and they were rebuilt...no help.
Is there anyone who can help me [or point me] in the right direction? I tried a new computer, new distributor, smoked the engine checking for vacuum leaks, and replaced the two injectors on the affected cylinders. I can get a good clean firing pulse on the two cylinders that are skipping also. I removed the fuel rail and manually pulsed the injectors...fuel flows easily from injectors. I had a local instructor look at it and he was baffled. I have ran out of options.
Because 1 and 4 are beside one another in the firing order, I lean toward ignition but I have tried it all. Any help would be greatly appreciated, Mike
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Joined: Mon May 25, 2015 10:46 pm
Location: Greenville, Alabama

Re: 1988 Ranger Skipping

Postby Fat Freddy » Fri Aug 14, 2015 10:16 pm

Other shops have replaced the usual things...plugs, wires, even the distributor

I replaced the distributor and the ECM

:?: :?

You really need to post the data files like you said you would.

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Re: 1988 Ranger Skipping

Postby roadserpent » Tue Aug 18, 2015 4:22 pm

Mike, one month ago you posted this same truck problem. You are being like the horse that is dying of thirst and we have led you to a nice fresh water pond - but you will not drink ! where are some pressure waveforms ? what was the valve lash clearance set to ? How are the cam lobes on these two cylinders ? If you don't post some info the guys on here cant be more then parts changers, much like the people that have spent big money on this truck already.
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