On my 93 loyale I am having an issue with the accelerator. When I try holding the speed constant, I get jerking as if I was quickly letting off the gas and then pressing it again. This happens even at highway speeds. It has been happening for a while now.

 

I bought plugs recently and will put them in tomorrow. I am also thinking perhaps a fuel delivery issue? Cap and rotor are fairly new. Has anyone else had this issue?

 

Some times it seems to not do this though it is more frequent it will do it.

Most likely a fuel issue change the fuel filter and you may even have scored some water in the fuel,if water is an issue Methylated Spirits will break up the surface tension of any water in the fuel allowing it to flow through the filters and injectors or carburettor jets OK without having to resort to a total system strip and clean in many cases.

The other possibility is high resistance plug leads or shorting leads,Multi meter resistance test will diagnose the first one,resistance will vary with plug lead length look for 5000 ohms up to a maximum of 12000 ohms for the longer leads.

Shorting of leads is visible as an electrical spark or even a purple haze visible at night with the lights off .

One other area that can be a problem as well is the Distributor cap and rotor button area,that pretty well covers the common areas that cause what you describe,Cheers Steve

put new timing belts on it,plugs,wires, a little high octane fuel, run it for a while see what happens:)

Well, after replacing the plugs, fuel filter, dist cap and rotor and wringing my hands for several months, the bucking loyale has been tamed.

 

It FINALLY threw a code, 32 - Oxygen circuit. I replaced the O2 Sensor and the horse is back in the corral, well tamed.

 

I have to admit I had no idea the process that worked between the MAF sensor and the O2 sensor. I thought sure I had some sort of rust or something clogging my fuel line or perhaps the TPS sensor was bad. It was only the $200 price tag that kept me from throwing that part at the problem.

 

Sorry for taking sooooooo long to get back to folks here. I had seriously considered *gasp getting rid of it. But my inner cheapskate held me back.

 

Thanks for everyone that tried to help.

Edited August 29, 201015 yr by MR_Loyale
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