can my plug wires be bad from overheating? i noticed all the passenger side wires were touching the egr tube could that have done anything internally without harming the outside they look fine but truck is running terribly and i can smell unburnt fuel in the exhaust. i'd like to know before i drop money on a new set cause these arent too old. how can you accurately test a plug wire?

 

use an ohm meter, should be very little resistance.

 

The spark plug wires should have less than 25,000 ohms resistance .

But if you see visible damage it is time for a new set

 

What brand are they?

 

the brand is balden or belden. its a 5mm plug. ive never heard of this brand they was just put on when i got the truck so i did not replace them when i did the rebuild but i did put a set of the ngk iridum plugs in. very expensive lol.

 

OEM plugs and wires is all you need.

:wabbit2:

 

does the dealerships normally keep simple parts like this in stock for older trucks or will it be another wait lol

 

You can get them online cheaper; try www.sparkplugs.com

 

Really depends on the dealership. Plugs they will have in stock. Mine has wires and most things I need. If not, takes 2-3 days at the most.

:wabbit2:

 

do they absolutely have to be OEM to run right? i had a z71 that i was told i had to run Acdelco or it woulnt run right so i spent 100 bucks on a set and they were no different from a set at auto zone i had.

 

We can't say for sure that wires are your problem, but experience here tells us OEM Denso is the better way to go.

Have you check in the dark to see if you're getting arcing at all? What do your plugs look like? How long have you had the problem? Did you do something immediately prior to the issue starting?

 

the plugs had soot on them i changed them i was getting a code 71 egr temp sensor i pulled egr valve mod and tubes checked for clogs but it all was good i also put new crush washers on csi fuel line.After i put egr componets and csi fuel line back i can smell raw gas in the exhaust i also replaced the o2 sensor with no effect. not sure how i caused a change by pulling csi fuel line and egr componets but i did some how. almost like it went from being little lean to rich

 

Is the CSI staying open & dumping extra fuel into the intake? That or a faulty VAFM are the only other things I can think of that would suggest what you're experiencing...

 

i pulled it out the plenum an put it in a jar turned key on an nothing happened but engine may been warm but i cant remember but even if it was warm and it was leakin wouldnt it have still leaked warm? and i dont think its the vafm cause it was an instant change. it ran decent then i pulled egr an fuel line put it all right back crunk it up and bam ran completely different.

 

could no fire on a cylinder or more cause the gas smell in the exhaust? it also started backfiring if that helps anything. and i have a small exhaust leak after i gutted cat.

 

I think you need yo temporarily plug the csi hole &is run it to see if it's leaking....anyone?

 

plug the fuel line of pull injector out of plenum and block off hole? where would i get something to block it off with?

 

i check plug wires they all had pretty much no resistance but one would go from 1000 to 3000 ohms? that one bad?