1986 Toyota pickup - sudden idle problems
I was performing the 90K mile maintenance on my 1986 Toyota pickup, and
decided to run some Sea Foam through it just to be sure everything was clean. I poured about 1/4 of the can slowly into the carburetor of the warmed up (and running) engine. It then coughed, backfired through the carburetor, blew out smoke and died. It restarted, but since then it won't idle at all, but will stay running very roughly if I give it lots of gas. I read somewhere else that Sea Foam can screw up the sparkplugs. So I took all of them out and cleaned and inspected them. No change. The engine will start but then die immediately unless I give it a lot of gas and keep my foot on the pedal. As soon as I let my foot off of the pedal, the engine sputters and dies. Did the Sea Foam cause this? I'm very disgusted, because the engine was running fine beforehand. Next time I'll leave well enough alone. Jason |
1986 Toyota pickup - sudden idle problems
> wrote in message oups.com... >I was performing the 90K mile maintenance on my 1986 Toyota pickup, and > decided to run some Sea Foam through it just to be sure everything was > clean. I poured about 1/4 of the can slowly into the carburetor of the > warmed up (and running) engine. It then coughed, backfired through the > carburetor, blew out smoke and died. It restarted, but since then it > won't idle at all, but will stay running very roughly if I give it lots > of gas. > > I read somewhere else that Sea Foam can screw up the sparkplugs. So I > took all of them out and cleaned and inspected them. No change. The > engine will start but then die immediately unless I give it a lot of > gas and keep my foot on the pedal. As soon as I let my foot off of the > pedal, the engine sputters and dies. > > Did the Sea Foam cause this? I'm very disgusted, because the engine > was running fine beforehand. Next time I'll leave well enough alone. > > Jason > Most likely the induction backfire blew off a vacuum line somewhere and you now have a vacuum leak. It may have even blown back through the carb and dislodged some crud or messed up a seal in the carb. It might have even blown an intake gasket, but the point is that it really wasn't the SeaFoam that did the damage, it was the backfire. There is a pretty good chance that the problem is minor, although it may be hard to find the vacuum leak caused by the backfire, but that is what I would be looking for if it was my truck. -- Kevin Mouton Automotive Technology Instructor "If women don't find you handsome, they should at least find you handy" Red Green |
1986 Toyota pickup - sudden idle problems
Thanks for your reply. I thought it might be a vacuum problem, but I
couldn't find any vacuum lines obviously blown off. Any idea where I can find schematics for the vacuum lines, so I know where to start? I'll have to get someone to keep the truck running, so I can try to listen for a leak. Is it most likely going to be right around the carburetor? If that doesn't work, is the next task to start dismantling the carburetor to look for a problem? Thanks, Jason Kevin wrote: > Most likely the induction backfire blew off a vacuum line somewhere and you > now have a vacuum leak. It may have even blown back through the carb and > dislodged some crud or messed up a seal in the carb. It might have even > blown an intake gasket, but the point is that it really wasn't the SeaFoam > that did the damage, it was the backfire. There is a pretty good chance that > the problem is minor, although it may be hard to find the vacuum leak caused > by the backfire, but that is what I would be looking for if it was my truck. > -- > Kevin Mouton > Automotive Technology Instructor > "If women don't find you handsome, they should at least find you handy" > Red Green |
1986 Toyota pickup - sudden idle problems
Pull the hose out of the brake booster and plug it while the engine is running. Seafoam was meant to be pulled into the engine thru a small vacuum line. Pouring petrol into the carb is a bad idea, unless you hate your facial hair.. -- corning_d3 ------------------------------------------------------------------------ corning_d3's Profile: http://www.automotiveforums.com/vbul...?userid=373828 View this thread: http://www.automotiveforums.com/vbul...d.php?t=593808 http://www.automotiveforums.com |
1986 Toyota pickup - sudden idle problems
> wrote in message ps.com... > Thanks for your reply. I thought it might be a vacuum problem, but I > couldn't find any vacuum lines obviously blown off. Any idea where I > can find schematics for the vacuum lines, so I know where to start? > I'll have to get someone to keep the truck running, so I can try to > listen for a leak. Is it most likely going to be right around the > carburetor? > > If that doesn't work, is the next task to start dismantling the > carburetor to look for a problem? > > Thanks, > Jason > > Kevin wrote: > >> Most likely the induction backfire blew off a vacuum line somewhere and >> you >> now have a vacuum leak. It may have even blown back through the carb and >> dislodged some crud or messed up a seal in the carb. It might have even >> blown an intake gasket, but the point is that it really wasn't the >> SeaFoam >> that did the damage, it was the backfire. There is a pretty good chance >> that >> the problem is minor, although it may be hard to find the vacuum leak >> caused >> by the backfire, but that is what I would be looking for if it was my >> truck. >> -- >> Kevin Mouton >> Automotive Technology Instructor >> "If women don't find you handsome, they should at least find you handy" >> Red Green > If you don't have a smoke machine the next best way to look for a vacuum leak is by listening for it with a stethoscope. We have electronic stethoscopes, but you can create a make shift one by holding a piece of rubber tubing to your ear and probing for the hiss of a leak with the other end. Be sure to check the power brake booster and A/C vacuum reservoir lines and maybe even examine the EGR and PCV valve to make sure there is no leak there. -- Kevin Mouton Automotive Technology Instructor "If women don't find you handsome, they should at least find you handy" Red Green |
1986 Toyota pickup - sudden idle problems
I now know not to pour through the carburetor. That IS the method
described in the instructions on the can of Sea Foam. They say it's also possible to use a vacuum line, but the carburetor is mentioned first. Maybe they should change their directions. My truck doesn't have power brakes or A/C. Any other recommendations? |
1986 Toyota pickup - sudden idle problems
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