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We've been battling this for months. The fuel pump went in the back tank which we were using, so we switched to the front tank which hadn't been used in a long time. Before that, the truck ran like a champ. The mechanic said to put Sea Foam in the gas. After that, we've had nothing but troubles. It started idling rough and blowing white smoke until we finally couldn't even get it to kick over. We thought, maybe bad gas. We emptied the tank and put new gas into it. Ever since, we've changed the fuel filter, tested the pressure in the fuel pump, changed the spark plugs and wire, and replaced all the fuel injectors. We got the truck up and running now but cylinders 3 and 4 seem to be missing. It's has white smoke coming out of the exhaust. We swapped the spark plugs again, but no luck It runs rough but when you get up to 30-40 mph, it rumbles. Any suggestions?
Take a look at the firing order.
You could have a wire in the wrong spot or it jumped time.
Always alternate tanks too as you can get a build up of water in the tank from condensation and gas can go bad in as little as 30 days.
The sea~foam was a good idea for a gasser to help elevate a bad gas problem.
Why did you replace the fuel injectors?
Quote:
Originally Posted by beckycat
It runs rough but when you get up to 30-40 mph, it rumbles. Any suggestions?
The reason the fuel injectors were replaced was because the mechanic said they were clogged. I didn't get it though because all 6 injectors clogged?? Anyhow, it wasn't kicking over but once they were replaced, it got it running.
We pulled all the wires one by one to test the plugs. When we pulled each one, the truck would bog down. When you pull 3 and 4, it didn't make a difference. This is how we came to the conclusion that 3 and 4 were missing.
Why would the head gasket or engine go when it ran completely fine before the fuel pump went out?
You should have drained the gas in the front tank first, THEN refilled with new and go from there. Seafoam is used to treat the oil and the fuel system, it loosens sludge, breaks up carbon deposits, etc. However, all that crap has to GO somewhere... in this case, it probably clogged your injectors even worse than they were originally, since you said it was running fine before. Because of this, you also may have fouled your plugs. I'd replace the plugs (all of them, some cheap copper ones will do until you get this issue sorted out) and try again.
If that doesn't work, then I'd check your spark plug wires themselves, and try swapping wires with ones from a good running cylinder to test.
Your new plugs are fine even if they got fouled somehow.
There is no need to replace them.
You could try replacing the fuel filter yet again, there would have to be a lot of crap for it to be clogged all ready.
Why would the injectors he cloged again they just put in a new fuel filter so any crap in the injectors didn't come from the fuel tank, but from the fuel lines after the filter.
Hmmm...
Hard to say. First of all, you mentioned the front tank had not been used in a long time. Chances are there was crap that had formed inside such as water, rust, and debris from old, stale gas. Secondly, when was the last the plug wires were changed? Old wires will "leak", as in the insulation dries out and since these operate and sometimes upwards of 20,000 volts, even a small crack in the insulation can cause arcing problems. Have you checked the cap and rotor if it has one? If so, remove it and look underneath for carbon buildup or erosion of the contacts on both the underside of the cap and the rotor tip. If there's a lot of erosion... replace it.
Has the throttle body been cleaned? What about the MAF? Is the engine light coming on? If so, have the codes run and that might pinpoint the problem further.
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It runs rough but when you get up to 30-40 mph, it rumbles. Any suggestions?
