Stalling All The Time

gregor · Dec 14, 2004

Every time i come to a stop my bronco stalls , i have checked the spark plugs and wires. it has a really low idle to, when in gear it idle's between 400 and 500 hundred. when in nuetral or park it idle's around 1000. Any idea's on what it could be? Please Help!!!

Ziggy · Dec 14, 2004

Not knowing what year your Bronco is or type of engine doesn't help, but I'll start with the basics. Look for disconnected vacuum lines and vacuum leaks. Pick up a can of carb cleaner and while your truck is running, spray the cleaner around the base of the carb and around the intake. Any rise in RPM's will indicate a vacuum leak that needs to be fixed. Check you timing against the spec's and make sure it is set up properly. Check your fuel flow, your filter may be clogged or dirty, I would just change it as they are cheap. This seems to be a big topic lately on the web. After that, if you could answer the first question would help us help you.

gregor · Dec 14, 2004

it is a 1990 with the 5.0 efi, i have already checked the vacuum lines and the seem to be good

STLKIKN · Dec 14, 2004

Have you tuned it up??
Changed plugs, cap, rotor, air filter, fuel filter??
Have you sprayed the throttle body down with cleaner?
If it is breathing and firing ok, and there are no vac leaks, it almost sounds like a TPS problem. (throttle position sensor)

Bradt · Dec 14, 2004

This probably isn't it, but while you're dealing with that stuff another thing overlooked a lot is the PCV filter in the airbox. Mine looked like someone had dipped it in motor oil and hung it out to dry.

brad

Seabronc · Dec 14, 2004

Have you checked the curb idle adjustment? If you look on the emissions control sticker, it should tell you the proper idle RPMs. It really looks low to me. A carbed engine is set aroun 650 in gear and that works out to around 1600 when not in gear. My truck will stall if it is set below 600.

Just a thought.

Good luck,

>-

gregor · Dec 16, 2004

i tried going to auto zone and they told me that because my check engine light was not on that none of the codes would show up. is there anything that i could try to check the sensors?

BK85 · Dec 17, 2004

My 85 5.0 EFI was stalling at idle a few years ago no matter where the idle was set. I changed the EGR valve, cheap, only a couple of bolts and the problem went away.

BK85

Seabronc · Dec 18, 2004

Ditto on the EGR. I don't know why I didn't think of that before when I posted. Atleast pull it off and take a look at it. It is probably carboned up or the diaphrqm may be broken. They tend to carbon up and stick open or shut or part way. In any event that will cause the engine to have all kinds of poor operating characterisdtics. If it isn't bad, then I'd check some of the control components and vacuum lines.

Good luck,

>-

gregor · Dec 18, 2004

thank you for all of the help. i finally got it fixed, the idle was really low so i turned that up and then i replaced the air and fuel filters because they both needed it. now it is running like new again.