TIMING

[EDDIE138301]

Can someone tell me something about the timing on a 93 bronco?

I changed the oil pump in my son's bronco. Instead of installing the rod of the oil pump underneath, I had a mechanic come by the house and he installed it by taking the distrib. out and installing it that way. He has changed a lot of them that way. My son is driving it. When he turns the ignititon over, it is hard to start. Also, when it does turn over, the whole engine is shaking for a second or two. When I have tried it, it works fine (of course). What could be causing this? Also, the idle is real low at times.

I will drive it this week back and forth to work. It sounds to me like the timing could be off a bit, but it has been such a long time since I have seen a car with a timing issue. Help!

 

[Seabronc]

Just a guess, but he may have gotten the distributor back in either 1 tooth off or mispositioned enough to make it hard starting. Spark is controlled by the TFI module on the distributor untill the key is released into the run position, from there it is controlled by the EEC. It is possible that the distributor position is off enough to make it hard starting and once it starts the EEC is making up for the poor positioning of the distributor but is operating close to the edge of it's parameters.

That is my guess

Good luck,

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[EDDIE138301]

Just a guess, but he may have gotten the distributor back in either 1 tooth off or mispositioned enough to make it hard starting. Spark is controlled by the TFI module on the distributor untill the key is released into the run position, from there it is controlled by the EEC. It is possible that the distributor position is off enough to make it hard starting and once it starts the EEC is making up for the poor positioning of the distributor but is operating close to the edge of it's parameters.
That is my guess

Good luck,

>-

what should I do? Get a timing light on it?

 

[Seabronc]

I'd go through the timing procedure which disables the EEC control while setting up the initial timing. Get a Chilton or Haynes manual, they should have the procedure in it. They are not my favorite books, but are better than nothing.

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[Roadkill]

I know this is going to sound crazy, but I have an off the wall idea. Where I work we have a Toyota Landcuiser that we use to run around on the camp. Guy I work with complained it would never start on the first try. When I drove it, no problem. Ever. A few days ago, I was sitting in the front seat with him as he tried to start it and noticed that he kept pumping the pedal. (looked like he was trying to pump up an air matress ) After about 5 or 6 tries it finally sputtered and came to life. I asked why he was doing it that way and he said thats the way "they" said to start it. (I am deployed right now and we got the truck from the unit that we replaced when we rotated in) Well, he is an officer and not very mechanically inclined so I explained to him the difference between a computer controlled fuel injection system and a carburator. Now he keeps his foot off the gas and it starts right up for him, too.

My point is that if it is always hard to start for your son, and it never gives you trouble, maybe the problem is not mechanical at all. Anyway, I would not even have thought of this if the Landcruiser problem hadn't happened so recently.

By the way, barring the above mentioned operator error, I think Seabronc's idea is good possibility. (I haven't seen him be wrong yet)

 

[Seabronc]

I know this is going to sound crazy, but I have an off the wall idea. Where I work we have a Toyota Landcuiser that we use to run around on the camp. Guy I work with complained it would never start on the first try. When I drove it, no problem. Ever. A few days ago, I was sitting in the front seat with him as he tried to start it and noticed that he kept pumping the pedal. (looked like he was trying to pump up an air matress ) After about 5 or 6 tries it finally sputtered and came to life. I asked why he was doing it that way and he said thats the way "they" said to start it. (I am deployed right now and we got the truck from the unit that we replaced when we rotated in) Well, he is an officer and not very mechanically inclined so I explained to him the difference between a computer controlled fuel injection system and a carburator. Now he keeps his foot off the gas and it starts right up for him, too.
My point is that if it is always hard to start for your son, and it never gives you trouble, maybe the problem is not mechanical at all. Anyway, I would not even have thought of this if the Landcruiser problem hadn't happened so recently.

By the way, barring the above mentioned operator error, I think Seabronc's idea is good possibility. (I haven't seen him be wrong yet)

Good point, I didn't think of it possibly being an operator error. But yes, the EEC likes to control the fuel during starting and likes the TPS to show closed during the start cycle. thanks for the compliment but I don't think my track record is that good :blush: . I only guess based on the description of the problem, just like everyone else.

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