I have a 1994 G20 van with a 5 liter engine. The engine was running last year like it had a fouled plug. Sluggish, louder muffler noise. I changed the cap and rotor then. This has usually fixed the problem. Not this time though. i then put in new plugs and wires. No help. I have checked all wires repeatedly. No grounding. This weekend I changed the electronic coil to the distributor. No change. Sometimes the engine runs good, like this morning when I first started it. It ran fine on the road for about ten minutes then went back to its lack of power and acting like it has a bad plug. Any suggestions?
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Check vacuum lines.
There is a large one on the power brake booster that goes to the back on the fuel system. Make sure you have vacuum before you try anything else.
A vacuum leak will cause you to stall out.
Does the truck run right? Does it smell real gassy, fuel mileage go south? If it is fouling plugs that fast it either has to be burning a lot of fuel or oil. Is there a check engine light on? Engine wore out, burning a lot of oil. Fuel injector stuck, using a lot of gas. Air filter dirty, making it burn way rich. I would think this truck would really smell bad if it is fouling out the plugs that fast.
the idler pully is going out there are two of them on that van. dont buy them from autozone because they only last about 5 months get them from napa. about 25 dollars each
Okay, there are a few engines that come in this van, lucky there the same except,they come with or without ac or airpump, so i will give you all of them and you choose the right one.
If it is getting spark and fuel check the timing. The timing chain may have jumped.Take out #1 spark plug and tap engine till the compression stroke comes up. To check just hold your finger over the plug hole and the compression will blow it out. Then rock crank by hand and set to top dead center. Take distributer cap off and see if rotor faces #1 cylinder. If you have spark to the plugs and the plugs are good and you have fuel timing or compression is all that is left.
Ck your exhaust pipe at rear of car noting any obnoxious smell like rottrn eggs. Hold a piece of paper, I use a dollar bill ,in in front of the exhaust. If it blows the paper gently, you have a catalyctic converter going or is bad. Will need replace if so.
i know changing the plugs in a van can be hard,sometimes when you have hard too reach spots aplug can get bumped, or cracked damgeging the plug or resetting your gap too zero,if this just started after you changed plugs i would check here first.
check your exhaust system and your muffler. a noisy fuel pump doesn't make sense, especially because a new one didn't change anything. if your muffler even has a tiny hole in it, it would make immense amounts of noise. the fastest way to check it (and you have to be very careful here) is to cover the exhaust pipe entirely with your hand RIGHT after starting the car (so it's still cold) if your hand is pushed off by a lot of force building up, then your exhaust is fine, if your hand can stay there with no resistance, and the noise gets louder, there is a leak in the exhaust system
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