Engine Running rough..

[bobstrat]

I sure hope none of you think I am being cocky, or whatever.

damn you active members.

 

[BroncoNutt]

Ok i Moved it a tooth over and it still runs like a pile of Poo!

Man guys .. I dont really have money to take it to a shop but it looks like I kinda have to..

Ive checked all vacume lines, the Firing order like 5 times, Messed with the timing, looked at all wires ect..

Im getting proper fuel,

The thing to remember... the truck started running like this after it got a full tune up, by an auto shop.

What could they have done?

The wires are brand new Bosch , the Plugs are brand new Bosch, and the cap and Rotor are "Auto lite"

Why would a truck run Great when I brought it into the shop.. and then Get it back running like a piece of dog crap with wheels?

I would bring it back to the shop but it got the tune up 1 year ago... It was parked in a driveway until October. Because it was backed into a tree. and had to get fixed.

PLEASE HELP!!!!! I KNOW YOU GUYS KNOW!!!!

 

[BroncoNutt]

Could it be the O2 sensor going out?

 

[BroncoNutt]

Their is this little plug that is near the Egr valve... It was rubbing on it.. It looks like its melted the wire and stuff and I can see the wire.. The wire looks rusted... what could that plug be?

 

[Yardape]

Try the map sensor, I am at a loss with your poor steed. Aside from being there and experiencing first hand what its doing I am unable to come up with an answer. Try the Map sensor, I just fixed a Bronco the other day with a faulty Map and it was running real bad, now it runs beautiful

 

[BroncoNutt]

Try the map sensor, I am at a loss with your poor steed. Aside from being there and experiencing first hand what its doing I am unable to come up with an answer. Try the Map sensor, I just fixed a Bronco the other day with a faulty Map and it was running real bad, now it runs beautiful

Whats a Map Sensor?

 

[Yardape]

Manifold absolute pressure I think its called. It should be ontop of your heater box to the left of your engine. Its a small black box, about 2.5 inches by 2.5 inches, has a vacuum line and a plug.

 

[BroncoNutt]

from what auto zone says:

"It Measures intake manifold vacuum pressure to help control the air and fuel mixture and timing. Contains a pressure-sensitive element that connects to an electronic circuit, generating a signal that changes with pressure changes in the manifold."

You know... Thats what it could be??

Was the Bronco Dying when put in gear?

And would it stall sometimes in park?

Was the truck really sluggish?

 

[Yardape]

Here see if you can make sense of it through this pic. Pic didnt upload. Do you need to see a picture?

 

[Yardape]

Are you asking me those three questions? If so yes, yes and yes. To test it first of all make sure it has vacuum going to it, unhook it and stick it on your tongue.

 

[Yardape]

Heres a picture of the sensor

MAP

 

[BroncoNutt]

Heres a picture of the sensorMAP

Where is it located???

I will do the test tomorrow after work.. Hopefuly thats it!

I will post back with more info.

Thanks!

 

[bobstrat]

when you timed it did you see the scale of numbers or did you use the notch ? im still trying to understand why we pulled the distributor. what page was that on? do you have a check engine light?

 

[Yardape]

Its on the heater box under the hood, to the far right of the heater box

 

[BroncoNutt]

I really dont think that the shop pulled it...

I pulled it to move it a tooth over, in turn I pulled it out to far and had to get the truck runnin again.

Top dead center on my Balancer isnt the notch.. its a paint mark that someone put on it.

Prob because the timing chain slipped before or the balancer is just old and slipped.

No check engine light anymore...

I think that since Maybie if the Map sensor is going out.. then It would cause the timing to be weird and

cause vacume problems or symptoms.

Is that correct?

 

[Yardape]

It would generally F*#@ up your computer, causing a small amount of chaos. Nothing permanent, it might have to run a minute or two after you solve the problem so the computer re-learns and adjusts.

 

[bobstrat]

I really dont think that the shop pulled it... I pulled it to move it a tooth over, in turn I pulled it out to far and had to get the truck runnin again.

Top dead center on my Balancer isnt the notch.. its a paint mark that someone put on it.

Prob because the timing chain slipped before or the balancer is just old and slipped.

No check engine light anymore...

I think that since Maybie if the Map sensor is going out.. then It would cause the timing to be weird and

cause vacume problems or symptoms.

Is that correct?

im wondering how you timed it. i would think if its the egr valve or the map sensor or the o2 sensor or any of the sensors you would get a check engine light. especially if the truck is running so badly. i mean no offense by this, but based on some of the stuff youve typed im guessing you dont work on cars often. nothing wrong with that, we all have to learn somehow. i know some of the things i did on my first car, someone should have shot me and the car. what i am suggesting is that you stop changing stuff now, rehash everything youve already done to it and lets get a fresh look at this. if you dont understand how to time it as well as top dead center, you can really fart things up. you need to make sure all this stuff is right before even worrying about sensors.

 

[BroncoNutt]

Ive told you everything Ive done to the car...

It seems like Im new to cars because All Ive ever worked on are classic Volkswagens..

Very Phew had F.I. Nothin hard about Vw engines at all!

Its just a new thing for me workin on American motors and realizing all the Stuff is on these motors

compared to a 70 hp Vw engine. You know what I mean???

I timed it using my ear.. Most people do it..

Ive ruled out everything it seems.. It woudnt hurt replacing a phew parts to narrow it down.

HERE IS EVERYTHING FROM THE START>>>

Last summer My uncle brought the Bronco to a shop called ( Presicion auto tune)

It was running fine but needed a scheduled tune up. Before he brought it in, it ran like a top.

Layed rubber easey and Beat all those hondas at the stop lights...

So He brought it to The shop and got it back running like crap... He didnt have time to bother bringing it back because he works

for himself and Is major busy all the time and it was his only truck.

Not long after that the Truck wouldnt start by turning the key so he had to start it by using the solinoid.

He was in a parking lot and it died on him in Reverse ( it used to never do that) He forgot to put it back in Park and started it and the truck started backwards twoards a tree. It smashed into the tree bending the bumper and pushing the right rear panel in a bit.

So it was "Totaled" by the Insurance company..

So he bought another bronco and Parked this one in his driveway for about a year.

He in turn gave it to me in October and I drove it around for a couple of days but knew something was wrong... I drove his 93 Bronco with the same motor and its really fast! And can lay rubber quite easely. But My truck ran very slugish, idled like ***** the engine shakes a little, and dies in Gear without giving it gas.

So I decided to Mess with the timing and see if that was it..

It helped a little but didnt do much. so I decided i would move it over a tooth. So i accedently moved the Dist to far out and had to find Cyl #1 and found that the "Notch on the Balancer" wasnt TDC. It turned out to be a paint mark.

I got the truck running and still runs like poo. I checked the Firing order and all lines and wires..

So I checked the plugs and they were fine and the Wires are brand new Bosch.

I found a wiring harness Rubbing under the EGR valve.. It looks melted and shows wire.. Not shure that could cause the engine to run like crap but thats all I found..

Now Im gonna get a MAP sensor and If that doesnt help... I dont know!

Whats got me stumped is what Could the shop have done to make it run like poo???

Thats where I am..

Help me ...

 

[bobstrat]

have you done a self diagnostic test yet? just to verify your computer is in fact working?

if you suspect the timing chain has slipped at least once why wouldnt you change the timing set? a bad timing chain can cause considerable engine damage. and we're not talking sensors price range. then you would know for sure that the crank and cam are where they're supposed to be.

 

[wtfdissux]

dont like to say this to anyone but think it might be better if you stop and let a proffesional take over from what I have seen you might need 10 labor hours to figure out what you did and correct pluss diagnose it the right way instead of blindly throwing parts in and pulling the dist. (something really not wise with very little good reason behind) if it needed to be turned then replace the timing chain not put another"band aid" on it for someone else to puzzle over when you give up