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Re: 1991 Wrangler 2.5 no start
Ok, been doing extensive troubleshooting over the last few days and am still somewhat stumped.
Here’s what I know:
1) spark was good from coil but weak to the spark plugs. Replaced the distributor + pickup coil and plug wires. Solved that problem. Timed the dist rotor to TDC on #1 cylinder, verified twice. Also, ignition coil and cps are new.
2) fuel pressure is good while cranking (I.e., steady at 40 psi) but drops off when key off - not sure if this is normal or not but with that good pressure at injectors while cranking should be good for a start.
3) compression is good (I.e., 120 psi) on all 4 cylinders.
4) Vacuum is bad. Flutters rapidly between 0-5 inHg while cranking. Starting to suspect that I may have a timing chain that has jumped a cog here, thoughts?
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2008 Tahoe SSV, 2007 Tahoe SSV, 94 GMC K1500, 93 Chev K1500, 91 GMC K1500, 2000 Wrangler Sport
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