96 Ranger Engine Surge
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Joined: Oct 2004
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96 Ranger Engine Surge
I have a 2wd 96 ranger with a 4cyl and manual trans. When I drive the truck without the heat/vent/ac on, it is fine. When I turn any of those on, the truck will drive fine initially, but it will experience an engine surge for about 5 sec. and then go back to normal. This will occur several times while I am driving, regardless of speed. It also will occur at idle. When nothing is on, the truck idles and drives fine. Any ideas on what I could do to fix this? I am concerned that it is going to idle up and make me crash.
Post Fiend
Joined: Jan 2003
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From: Connecticut
Welcome to FTE!
Is the engine surging or bucking? All climate controls modes (except "vent" and "floor") cause the A/C compressor to run, meaning it cyles on and off. Could it be that you are feeling the extra load being put on the engine when the A/C compresor kicks on?
Is the engine surging or bucking? All climate controls modes (except "vent" and "floor") cause the A/C compressor to run, meaning it cyles on and off. Could it be that you are feeling the extra load being put on the engine when the A/C compresor kicks on?
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The engine seems to experience a short term increase in RPM. It seems like it is overcompensating for the increased load. I would liken it to the increase in RPM when the engine is cold in order to maintain proper idle. It is very short, 5-10 seconds, but it repeats throughout your drive.....randomly. It seems to only do so when the engine is cold. I also believe the truck has the wrong thermostat because it never gets higher than 1/4 of the temp gauge. I am going to change the thermostat and see how that affects things, but I doubt that would make the engine surge.
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Joined: Sep 2004
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From: Fort Worth
as far as the tempt gauge it's probably fine, I have the same truck, same engine, it never even gets up to the little icon half way up, if it hits the icon i start to worry...only does that with the ac runnin in a traffic jam.
And the surging, mine does that as well, but when it's at idle speed i can hear the clicking of the compressor clutch going on and off, and the rpm jumps from about 800 up to 1300 then back down a few seconds later
And the surging, mine does that as well, but when it's at idle speed i can hear the clicking of the compressor clutch going on and off, and the rpm jumps from about 800 up to 1300 then back down a few seconds later
