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91 ranger hesitation in all gears
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chasman50
New User
Aug 30, 2009, 5:14 AM
Post #1 of 5
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91 ranger hesitation in all gears
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'91 Ranger
2.3l 5sp manual trans.
107049 miles
last 8 of vin: NTA32937
Engine starts and runs normally in neutral. Throttle/engine response normal in neutral. When starting out in 1st gear, engine begins to hesitate, and is not responsive to throttle. I have to feather the throttle for the engine to recover. Replaced plugs, wires, checked air filter(ok). I'm not sure when the fuel filter was last changed. Timing belt reported to be changed a few months ago. The situation "just started". Symptoms do not occur with the rear wheels off the ground.
I'm a diesel refrigeration technician by trade, and these gas-ers throw me once in a while.
Thanks,
Chas
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 30, 2009, 5:21 AM
Post #2 of 5
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Re: 91 ranger hesitation in all gears
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Your problem is only showing up under load. You need to first use a spark tester to determine if the spark is dropping out when this happens. If so, the coil is likely. Also take a vacuum reading. If the vacuum is low, suspect a plugged Catalytic Converter
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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chasman50
New User
Aug 30, 2009, 5:25 AM
Post #3 of 5
(2195 views)
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Re: 91 ranger hesitation in all gears
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Being a diesel mechanic, I pulled the spark plug wires one at a time to listen for an engine "miss". Being it has 8 plugs, some made a differance, while others didn't.
I'll check the vac, how do you tell if the catalytic is out?
Chas
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 30, 2009, 5:28 AM
Post #4 of 5
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Re: 91 ranger hesitation in all gears
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It will only do any good to check the spark as the failure occurs. It won' tell you anything if test at any other time.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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chasman50
New User
Aug 30, 2009, 3:57 PM
Post #5 of 5
(2178 views)
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Re: 91 ranger hesitation in all gears
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After doing the tests, and further inspection, I didn't find any vacuum leaks, but plenty of exhaust leaks. The muffler looks like it was hit by a shot gun, and most of the gaskets from the manifold through to the catalytic converter are leaking. The filler tube on the gas tank also has a hole in it. I found this out when I put some more gas in the tank. I didn't notice any vac at the carbon canister, but had plenty everywhere else.
I did notice a major hesitation at the throttle just past opening the body. It almost kills the engine.
Chas
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