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Hey y'all, I was wondering if you could help me out a bit. I have spark knock under accleration at about 45-50 mph and maintaining speed between 65-70 mph. I have changed the timing chain and gear, retarded the timing, and replaced the plenum and intake gaskets. Problem still isn't solved. Does anyone have anymore ideas? (And a stick of dynamite isn't an option *L*) Thanks.
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Where is the PCM located and I'll go look for that sticker? and what's a deathflash? honestly, it sounds kind of scary...also, forgot that occasionally, it will cause my check engine light to come on (sometimes solid and sometimes blinking) and i've had it scanned and the scanner is not coming up with any codes.
The stock "death flash" wouldn't cause pinging/spark knock, its designed to prevent it.
How did you retard the timing? Only way to do it on these trucks is with a tuner, you can't manually adjust it like you could on the older vehicles. Turning the distributor or whatever you may have done is bad, causes issues. Undo it.
The stock computer's "death flash" (do a search) retards the timing to far as it is anyway.
After you changed the plenum, did you reset the computer (disconnect the battery, turn on the headlights for a few seconds, turn off the headlights, reconnect the battery)?
Have you checked fuel pressure at the rails? Tested the injectors? Any upgrades to your truck? How long since your last tune-up? (What plugs, wires do you use?)
started about a week after plugs were changed (wires havent been changed for awhile and those were whatever autozone carries). champion RC12LC4 (436) plugs were gapped before they were put in. timing was retarded at distributor (dodge dealer mechanic said i could do this, guess he was wrong *sighs*) the rails and injectors have been tested and they all came out as having no problems. the computer was reset after the plenum gasket was changed, changed the thermostat while was in there as well. no upgrades have been made except for the tranny being beefed up a bit for pulling. oil, plugs, and filters were changed about a month ago.
It's been scanned since the CEL has come on and nothing comes up. No error codes or anything. Tried running 91 octane, still knocks. Right now, down to considering hijacking the pcm out of a 98 that I have sitting in the yard with a bad tranny but really, really dont want to do that because im afraid it will cause even more issues.
what kind of plugs did you take out?
the ngk and autolite 3923 plugs are the most popular on this forum, at least thats the plugs that i've seen people talk about the most.
i don't care for champions, i run the bosch platinum +4s and i like them.
it seem to me that your engine doesn't agree with you turning the distributor and possibly the new plugs.
oh, and i'm pretty sure that dodge doesn't require any of their mechanics to be ase certified. so taking advice from them probably isn't the best idea since they just go by what the book says and not what the vehicle is telling them. if they were any good then they would be able to diagnose an issue and get it fixed on the first shot instead of throwing parts at it until one of them fixes it.
also, there is a chance that the plenum gasket got fouled up somehow during the install and blew out again. or the belly pan could be loose.
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Last edited by Sheriff420; 10-25-2009 at 01:59 PM..
I have been accused of babying it a bit. I know that I shouldn't but well honestly, its the nicest truck ive had and have been trying to keep it that way. I could try the seafoam thing but was thinking about doing Lucas injector cleaner (not 100% sure of the name). Any one have any opinions on the lucas? Took out either bosch or champion plugs. Plan for now (i think) is to fix the distributor that we screwed up, have it re-scanned (thank heavens for friends with good scanners!) and see what comes up. If nothing comes up there, think we are going to go after the plenum plate and all those fun lil gaskets, and then head gaskets. For now, Im going to go out and look for any factory update stickers as opinion seems to vary on whether or not death flash could be the issue. Could ethanol in the gas have any bearing on the issue? thanks for all the help and ill check back again in a little bit.
My friends Ranger was owned by an old man and a lady with one arm (it's a manual), so it was babied. It pinged like crazy when he got it. We seafoamed it, the ping was gone and hasn't come back because he doesn't baby it.
I agree with Hahns, there's probably tons of build up, and if the carbon's getting hot and causing pre-ignition, even higher octane won't stop it.
Get a can of the Mopar Combustion Chamber Cleaner. It's easier to use than a can of seafoam and costs about the same. Dealers in Dallas sell it for about $8 a can. The lucas will take too long to soften and get rid of the deposits, the MCCC and seafoam are an almost instant fix.
Did you know you can also use a small cup of water instead of the the seafoam in the brake booster hose? Just go really slow so you don't hydrolock the engine.
Get that disty set to 0 and then trouble shoot if the cleaning doesn't help.
Also just double check and verify that the No. 5 and 7 spark plug wires are not touching at all, and that you keep the ends on the disty at a right angle.
Important Qualifier: the bf thought it would be best if i pointed out that putting seafoam in certain dark holes of the human anatomy would not be an option. *L* he also asked if it was an oil additive or fuel additive?
It can be both. It's most effective when introduced directly into the intake via a vacuum line, let it suck down about 1/3-1/2 a can at around 1200 RPMs,, then shut it off and let it sit for 5-10 minutes and start it up and rev it up and clear out all the smoke.
The stock "death flash" wouldn't cause pinging/spark knock, its designed to prevent it)
Yeah, I don't know where I was going with that! LOL I know that too much timing can cause pinging, not too little.
However, atleast we have determined that the truck does in fact have the flash. Which can be fixed with a Super Chips tuner for instance, if you'd like to have some more power. And I do agree that between babying it and the carbon build up from the blown gasket could be the problem. As a side note, if the plenum was blown, the precat o2 sensor and the cat are probably in need of changing.
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