Tachometer fluctuates at constant speed?

Question

PLEASE HELP!!
I have a 1999 Jeep Cherokee. It all started a couple of month ago. Every time I turned left, my car will loose speed and I noticed the tachometer will go all the way down. I will then push the accelerator some more and the speed will come back. Now, it got to a point where I'm in the highway, at constant velocity, and my tachometer will fluctuate. I can feel my car pushing the engine to work some more during the fluctuation period. Whats wrong with my car? snif snif What do I need to do?

Answer 1

One possibility, Sounds like your fuel filter may be getting clogged. This will cause sluggish performance. It could also be time to get the carburator/fuel injectors cleaned.

Answer 2

Normally, with a wonky tachometer, I would suggest an ignition system problem, but the "left-turn" phenomenon is definitely interesting and does suggest a fuel system issue.

Still, my instinct is to suspect an intermittent short somewhere, either in a spark plug wire or somewhere else in the ignition system. (This short could be induced by engine movement in turns, so it's not automatically a fuel problem). People tend to suspect fuel systems, but easily 90% of car running problems are ignition electrical problems. Unless you live in an area where the gasoline tends to be poor quality, I wouldn't go hunting in the fuel system just yet.

Sadly, these electrical faults are not fun to troubleshoot -- all cars are different and the ignition systems can be disgustingly complex. Does your engine have a distributor, or is it distributorless? Does it have a magnetic distributor, or an ignition module? Does it have an engine module and no ignition module at all? Does it have both an engine module and an ignition module? You can see how this gets confusing.

Here's a suggestion for something to try -- using a service manual for your Jeep, locate the tachometer sender wire (it will be part of a wire harness and be bundled with some other wires). When you find it, look for your problem anywhere between where the tachometer sender plugs in and the engine block (this could include an ignition module, high tension wire, spark plug wires, etc.)

Answer 3

Hope this can help.... can always im me. Duhibrokeit2000

Turning any direction. I'd say you have a clogged fuel something.....A fuel filter as stated before. Is your fuel near empty or full when this happens? How long has it been since you changed your plug wires? If never, one of them could be chafing, and grounding out causing it to miss on that cylinder. (You can check this at night by raising the hood and running the engine. using a wooden broom handle or something non conductive, move the plug wires around and see if you see arcs going to the engine... it isn't dangerous well keeping it away from the fan..., just will eliminate the plug wires option if they were grounding out
From air moving them under your hood while driving.

Newer cars are known to have more than one fuel pump. The lower pressure pump in the tank, and the high inline pump somewhere on your frame rail usually somewhere under the driver seat area. It could be filters, or the high-pressure pump going bad. Or wiring to the high-pressure pump grounding out somewhere. Have you had the vehicle off road much? Could be a numerous amount of things. That is the joy of trouble shooting your own problems. That is why people lease vehicles now days, in 2 years you give them up, and never have to deal with maintenance besides oil, fuel and windshield washer fluids.

I have a Toyota Tacoma, and the guy at the local dealer is awesome! I have had problems with my Tacoma, and I’ll ask him, I think it is either this or that. He will honestly say, its probably this rather than what I stated, or tell me the problems that they see day in day out that the public doesn't know about. So that is also an option.... going into your local reputable dealer for some help...

Answer 4

sound like a fuel problem for sure might just be the sock in the tank probably cost about 200 bucks to fix but id change both fuel filters too good luck but as pretty as you are i bet you can find a guy to do it for you

Answer 5

change the fuel filter put sum STP in the gas tank to clean injectors, fuel sytem....that should do it.