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Old 11-11-2008, 11:28 AM   #1
Spartan
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Thumbs down Bronco 2.9 Starter problems

Okay.

89 Bronco 2 XLT, 2.9L Manual transmission.

I turn the key, the starter grinds. The spacer plate is intact and positioned correctly. The starter teeth and the flywheel teeth are all fine, no chips or missing teeth. The starter bolts are tight and the main cable from the solenoid to the starter is new looking, with no bulges or corrosion. Motor turns over just fine by hand, and is push startable. bench testing the starter with direct battery power kicks the bendix out all teh way, and spins correctly, it does not wind down like a bad armature would.

Voltage readings:

Battery voltage: 11.48V
Verified post to post, and positive to ground.

Battery to battery side of solenoid: 11.48 Volts

Battery negative to starter side of solenoid when cranking: 6.5 volts or so, creeps to 9 volts if the key is held down.
Voltage is the exact same as read from the lug on the starter to the bell housing

We swapped another solenoid in from an explorer, and it just clicked...no attempt at turning over that time, just a *Click* Swapped the other solenoid back in, it ground again

We cleaned all the contacts on the solenoid, the starter, and the battery, no difference in voltage or symptoms.


The main engine to battery ground WAS NOT touched yet, it is our next project.

My theory is that the starter is fine, I'm having a power delivery problem. It has enough power to kick the bendix out all the way and spin, but not enough to keep it held out, causing it to grind on the flywheel.

Any Ideas? I need Help soon, my 88 Thunderbird is going into storage!
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Old 11-11-2008, 05:28 PM   #2
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Might be a in-line fuse??

Have your tried a different battery???...could have a cell or 2 on the weak side
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Old 11-13-2008, 06:45 AM   #3
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I see an error just reading thru...there should be no battery negative to solenoid wire, or are you speaking of the positive wire that runs from the solenoid to the starter itself? if so, your voltasge measurements seem to indicate a bad wire or connection there...
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Old 11-14-2008, 01:13 PM   #4
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SO.

We replaced the starter solenoid and the negative cable the other night....no dice.

I did find something interesting though. The negative cable runs down the passengers side frame and bolts to the engine block. Well, it also has the fuel pump ground running to a metal bracket that the negative cable runs through. In this area, the negative cable's insulation was SPLIT, and corroded the wire. The ground cable in this area also looked a bit MELTED.....uh oh LOL

SO, we replaced everything, and it still grinds at start. we pulled the starter for the 5th time, and used the best looking pieces from the two we had to try to make one good one.....no dice. it was ****ed.

My theory is this: The ground cable was the problem the original owner had with the vehicle. He replaced the starter, but is slowly started to do the grinding thing as time wore on, until it ground all the time for me. I think that the bad ground made teh starter heat up, frying it slowly internally. This would explain why a fairly new starter was plain SHIT. The spare starter I got with the truck was likely shit from the word go, as we took it apart..the brishes on the motor were shot and the thing sounded wierd.

So we are throwing a new starter on it tommorow, and seeing if that fixes it. I hope it does, cause its gonna be getting cold soon!
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Old 11-18-2008, 03:19 PM   #5
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did you have any luck with it? It sounds like i am having the SAME problem.... i have a 91 ranger with an 89 B2 motor/trans.......

My flywheel is fine and i have tried NUMEROUS starters on it and nothing has worked....all it does is grind....

If you found anything out, give me a shout!
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Old 11-18-2008, 04:04 PM   #6
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It appears to be a ground issue. We think that the crap ground wire (negative battery cable to frame to engine) made the starters heat up and killed the windings. after replacing all teh cables and the solenoid, we replaced the starter. It works fine now!
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Old 11-18-2008, 04:17 PM   #7
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Were you able to start it without kick-starting it before fixing it?

Im just trying to see if its the same issue that im having.... mine would barely grab the flywheel, but wouldnt kick it over.
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Old 11-18-2008, 08:53 PM   #8
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I inspected my ground wire and it was corroded pretty bad, so i put a new one in. A while back i put a new solenoid and new positive wire in. I also put a brand new battery in....... it is till doing the same thing to me.... any ideas for me Spartan?
Thanks
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Old 11-19-2008, 08:23 PM   #9
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11.48 volts with the truck off is far to low. A battery that has been fully charged, and has been sitting for at least 30 minutes after being fully charged should be 12.55-12.65 volts.

More then likely a cell has given up in your battery.
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Old 11-21-2008, 09:13 AM   #10
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Default starter ring rear problem

I have same problem started off crunching tell it would not even engage. I looked at ring-gear it looks fine. Replaced starter and the replacement starter will not even engage the ring-gear. Original starter will enagage with a crunch once in a while!
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