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Old 11-27-2012, 08:31 PM   #1
GripLock
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351 dies when stopped

Hey Guys I am a renewed Bronco owner. Had a 90 when i was 16 and 10 years later ive stumbled behind the wheel of and 89. I got this bronco from my stepfather who had a zip tie rigged around the throttle to keep the idle up so it wouldnt die at the stop signsI have spent hours upon days this last 2 weeks on here searching for and answer. He had replaced the egr, cleaned the iac and tested the tps ( 1v at idle). So i replaced the IAC seemed like a good idea and cut off the zip tie. The truck did great until i got down the interstate and it cut off at the light after the off ramp. I guess i need to mention it happens when the engine gets warm. He thinks it is a vacuum leak so i went outside earlier cut the truck on and started sprayed hoses with a squirt bottle and had no results. I am not a mechanic, if it doesnt have 2 easily reachable bolts and a plug or very clear and easy instructions i cant do it lol. So i have 2 questions- The check engine light is not on so will it still show codes? I went to autozone but the didnt have the odb1 connector , I wanted to ask before i wasted time trying to get codes. Question 2 If it is the vacuum system should i try to tinker with it my self or should i just spend a little bit of money and headache and send it to the shop. I didnt want to start another idle thread but i had to
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Old 11-27-2012, 09:43 PM   #2
GripLock
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The yellow plastic piece that is connected to the cruise control on top of the motor is broke , i need to replace this but i dont know what the name is for it??
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Old 11-28-2012, 10:21 AM   #3
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Talked to the PO today he said he plugged up some of the vacuum lines one day trying to troubleshoot. He said he since he did that it will throw up some codes on it ?
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Old 11-28-2012, 02:38 PM   #4
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first step would be to fix all the vacuum lines! steve83 or miesk have vacuum diagrams, search for them on http://www.broncolinks.com/index.php.

Long time ago i replaced all my vacuum lines based on a writeup on this thread, cant find it at current, but it may be on broncolinks as well. or maybe im using the search wrong here.

My 351 in my F350 is doing the same-ish thing but only if i rev it up over 2000 then get off the gas coming to a stop. I think vac is my problem with that, as it is effecting my C6 shifting too.
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Old 11-28-2012, 10:10 PM   #5
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That site is great wow. I read up on pulling codes so i grabbed a piece of wire and pulled em. That was easy .I was ready to spend the 30$ on a reader lol. I pulled codes 21 and 24. Im gonna try to figure out what that means lol
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Old 11-28-2012, 10:22 PM   #6
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I checked again and waited the extra six seconds . I pulled 34 also
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Old 11-28-2012, 11:43 PM   #7
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I'd go to the junkyard and get the whole throttle cable assembly. Thats what I did and it breathed new life into my Bronco
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Old 11-29-2012, 12:20 AM   #8
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Search for ECT, ACT, CANP. These are easy to test and repair, especially with a Haynes Manual available from the Auto Parts store. Just try and ask questions here. Many will step in to help.



DTC 21 - Engine Coolant Temperature (ECT) Sensor out of range.

DTC 24 - Air Charge Temperature (ACT) Sensor out of range.

DTC 34 - Evaporative Emission Control System (EVAP) fault.






ECT



ACT



CANP (EVAP)



Throttle Cable (see this link: '94 XLT - sticking throttle - help?



Vacuum Line Replacement (see this link: Replace Plastic Vacuum Hoses with Rubber)
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Old 11-29-2012, 12:26 AM   #9
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I have nothing new to add... but the link above for the replace plastic with rubber lines, thats the one i used when i redid all mine!
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Old 12-29-2012, 03:51 PM   #10
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Thanks everyone for your input i got a little caught up with christmas so working on the bronco got put to the side. I am taking the bronco into my buddy's muffler shop next week to remove my cats to see if this could be my problem. Ive spoke with a few people that said my cats could be clogged causing it to stall.
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Old 12-30-2012, 12:44 PM   #11
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test your ignition conrtol module, mine did this exactly. and be weary of cat less... my valves are burning up now becuase of it.
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Old 12-30-2012, 12:47 PM   #12
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Originally Posted by FSB BOSS View Post
my valves are burning up now becuase of it.
what?


OP? are you sure there are no vacc leaks? i get lucky spraying starter fluid where i suspect a leak... if the RPM jumps.. thats it.

also, does it happen when cold?
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Old 12-30-2012, 01:11 PM   #13
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No im no positive on the vacuum leaks guess i need to pick some starter fluid before i start cutting pieces of the truck. No it only happens when the truck gets warm . It doesnt die all the time occasionally a sputter when i take off. Ive noticed it happens more when i have to come to a quick stop
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Old 01-09-2013, 02:18 PM   #14
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well drove the truck a good bit today brought it home and proceeded with the starter fluid.(my bronco is not a daily driver) I sprayed the vacuum lines all a few times and had no jump or drop in rpms so im headed to the muffler shop now. Ill let yall know how it goes
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Old 01-11-2013, 08:31 PM   #15
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Wasnt my Cats but my engine definently breaths better now. Fuel filter is next
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Old 01-11-2013, 10:07 PM   #16
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I am going to go with a vacu leak as it does it when its warm and not cold... having a vacum leak when the rpms drop used to kill my 94 marquie evertime I stopped.. 0.30 worth of vacum hose fixed it.. not sure about your model but spray all the hoses as sometimes its the least youd exspect..
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Old 01-11-2013, 10:34 PM   #17
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I wonder if your vacuum leak is internal to your brake booster. you would not see it with starter fluid.

you can run the engine with a vacuum guage and see what it is showing.
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