volvo 96 850 dieseling help please!!!

arsenal6 · Post by **arsenal6** » 17 Apr 2010, 17:07

Hey guys, I am in need of your help! I have tried fuel cleaners and I have decided to give seafoam a shot, but I am afraid of screwing up. I know its likely a carbon build up because my dad was using non-premium gas for the last 5-6 years with it. I started using premium since last april.

I don't want to hydrolock like https://www.matthewsvolvosite.com/forums ... =1&t=13217 he did, I was hoping someone had a tutorial or perhaps I do not need to run it through the intake?

If you have any other ideas or suggests please let me know!

Thankss!

whoa · Post by **whoa** » 17 Apr 2010, 17:09

just don't let the hose gulp the stuff. put a vacuum hose on the vacuum tree, dip it in the seafoam, let the engine sip a little, and pull the hose out. you'll get a feel for how fast you can introduce it without causing the engine to cough and sputter.

HOWEVER, a fuel-injected engine should not have any gas available to diesel with. You probably have leaky injectors (in addition to carbon deposits). Put some of that seafoam in the gas tank. But probably you'll need to replace your injectors or send them out to be reconditioned.

Post by **jblackburn** » 17 Apr 2010, 17:43

HOWEVER, a fuel-injected engine should not have any gas available to diesel with. You probably have leaky injectors (in addition to carbon deposits). Put some of that seafoam in the gas tank. But probably you'll need to replace your injectors or send them out to be reconditioned.

Exactly. It's common for old carbureted engines to do - there was an idle valve in my old Honda that loved to stick and make it idle at 3,000 RPM and it would diesel for 1 minute after you shut it off, but a FI car shouldn't, as the injector pulse is cut off with the ignition. Pull out the fuel rail and hold it over a bucket and crank the engine, then let off. Fuel flow should stop immediately after the injector pulses.

Post by **Hoov** » 17 Apr 2010, 23:10

Just agreeing here. Your injectors are the guilty party & need some help. Check out the tutorial section & search Fuel injector repair. It will give you a clue about the subject & help you decide if you wish to try this yourself.
My vote is "do it yourself" ... Intimidating but not as difficult as it looks. Just do your homework! There is a TON of knowledge already there & if you have a question (I'm sure you will) the good folks here have willing answers.
This can be expensive but truly is not that hard to do. Just seems so because of all the "new stuff & ideas"
If you already wrench, my appologies. These comments were not directed towards you specificaly but a general thought from what I have heard from folks I have helped fixing this stuff.
LOL, Blows their minds until they actually end up fixing it themselves & everytime the comment at the end of the job is, "That was pretty easy!" ... Yeah! With a scoche of direction & knowledge it really is a piece of cake. ... Mathew & all the generous folk posting here have provided both for all of us here so don't be shy.

Hoov ... LAWD! 4 lousy months owning a Volvo & I'm already "Sharing"!!! Pathetic! HAHAHAHA

arsenal6 · Post by **arsenal6** » 18 May 2010, 18:43

I finally seafoam the car, i used 1/3 of a can. It did good afterwards, no dieseling. However its kind of coming back. Not really looking forward to cleaning the injectors. Possibly another run with the the seafoam?

Post by **jblackburn** » 18 May 2010, 18:47

I would start pulling out the injectors and have a look at them each. If they're cracked or leaking after the engine's shut off, seafoam isn't going to help; they will just need to be replaced. Unscrew the fuel rail and pull them gently straight up.

Post by **polskamafia mjl** » 18 May 2010, 18:58

+1 for the injectors. Stop with the seafoam and and take a look at the injectors.

NcTrooper10722001 · Post by **NcTrooper10722001** » 18 May 2010, 19:03

This sounds stupid.. but try it... Get the motor all warmed up.. Remove the big intake hose, run about 2000 rpms, and squirt cold water into the intake.. this will de-carbon the valves and hopefully solve ya problem. Ya may have to do it a few times and prob set off a Mass air flow code.. no biggy.. try it! it worked on my F-150 .. Carbon continues to glow red hot in the cylinders after ya shut the engine down, thus causing diesel action.. pls try it and let me know how it goes..

NcTrooper10722001 · Post by **NcTrooper10722001** » 18 May 2010, 19:07

Also. fuel injectors WONT pulse after de-ignition.. keep ya hands off those injectors.. lol

Post by **Hoov** » 18 May 2010, 20:02

NcTrooper10722001 wrote:Also. fuel injectors WONT pulse after de-ignition.. keep ya hands off those injectors.. lol

I can't agree with you here. Your thought about the water actually works. I used to do it myself years ago but as for "keep ya hands off those injectors" ... Not so much.
The only reason the engine continues to run on is because it has fuel to do so. PERIOD!

You need fuel, oxygen & heat to start a fire. Eliminating carbon deposits will break that chain by eliminating the heat & the diesling will stop. BUT then you still have the fuel situation.

So now we have leaky injectors w/no symptoms but every time you shut off the engine the cylinders are washed of oil by fuel leaking. Doesn't bode well for engine longevity considering the next start up will be accomplished in a non lubricated, dry cylinder. Not cool!
You are right in that the injectors won't pulse when the electrical is cut off but if they are leaking they will still drop fuel into the cylinder.
The engines injectors are in need of attention. ... Where else could the fuel be coming from that allows the engine to run on with the carbon deposits supplying the heat?

Hoov