86 B2 won't start
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From: Sumner, WA
86 B2 won't start
86 B2, 2.9, 5sd, 4x4. B2 failed a smog test. diagnosis=injectors. Pulled and had injectors overhauled. After reassembly will not start. Checked pump pressure. 40psi key on not running. Jumped pump lead to confirm fuel is circulating through pressure regulator-yes. Ran trouble codes. Code 19-ECM failure. Replaced ECM. Still won't start. Sprayed starting fluid into plenum. Runs until runs out of starting fluid. Has strong spark at plug wires. Checked relays--ok. Checked injectors for correct ohm resistance--ok. Have 12 volts to injectors. I have fuel. I have spark. I have air. It should run. And it does until the starting fluid runs out. Which in my mind says the injectors are not flowing. I have already pulled the plenum to double check for vacuum leaks--no. What are the odds that the injectors aren't any good although they were rebuilt by a reputable shop. I would appreciate any ideas.
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From: Sumner, WA
As to the ground side of the injectors (I found this a bit confusing), there is power at both terminals where the connector attaches to the injectors. Does the ECM control the injectors by providing the ground or do the injectors ground to the manifold when installed? All I have to work with is a Chilton's and a Haynes manual and zero training with fuel injection. I'm just groping along in the dark. The trouble code was 19. There are no silly questions except those not asked as we all overlook the obvious at times; but yes I did check all the vacuum connections.
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You're probably right. I'm leaving to borrow a set in just minute. However, is there supposed to be power to both terminals on the injectors? If not, why do I have power to both terminals. Wiring schematic says there should be power from the fuel pump relay coming to one side and three of the injectors are wired to post 58 of the ECM with the other three wired to post 59. How do the injectors ground? I appreciate the input folks. Keep up the good work.
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To update the situation: The noid light flashes on all six injector plugs. So I take it that the injectors are not firing. Why would all six fail. They were just cleaned and tested. According to the paper work they all tested within specs before I brought them home and installed them. I have, as I said, checked them with an ohm meter also.
Do they sell hand grenades on E-bay?
Do they sell hand grenades on E-bay?
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From: Sumner, WA
The ground seemed ok; but I will recheck it and perhaps enhance it a bit. So is it possible that the ground is good enough to light the noid light but not trigger the injectors? Thank you for the info on how the ground works. It is how I suspected it to be; however, suspicion is not a very good premise to build on.
Interesting comment the "King" made. Do you suppose that was his way of saying hang in there
Thanks again.
Interesting comment the "King" made. Do you suppose that was his way of saying hang in there
Thanks again.
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Latest update: I redid the ground. No difference. I checked the voltage to the injectors and from the injectors to the ECM--voltage is good (I thought there was power leading to both terminals before; but when I tested the connectors off of the injectors only one side gets power in.) There is a .02 voltage drop across the injectors. The injectors ranged from 13.5 to 16.1 ohms resistance (spec is 11 to 18). I took the fuel rail with the injectors still installed and the electrical connectors also installed and then (with fire extinguisher at the ready) turned the engine over. The injectors did not pulse or spray or even dribble. I stuck an electical test light probe into each of the wires that run from the injectors to the ECM and it pulsed when I turned the engine over. Can the coils in the injectors fail and still have all of the suggested tests say they're ok?
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Mystery solved: After finally reaching the shop that overhauled the injectors I was told that because I didn't install and run them immediately they tend to freeze up. To bad he didn't mention that when I got them. They sat for couple a months as the Bronco is not my primary ride and I wasn't in any big hurry then to get it running. So folks, if you're going to work on your fuel injectors, put them in when you get them home.
PS: In my research of injectors I have noticed that some of the online services mention that their products are dipped in some sort of parafin before packing and shipping. I will ask Dr. Injector why he doesn't.
Thought for the day: Education is expensive! It will always cost you time, or money, or hard knocks, or all of these.
Thank you all for your input.
PS: In my research of injectors I have noticed that some of the online services mention that their products are dipped in some sort of parafin before packing and shipping. I will ask Dr. Injector why he doesn't.
Thought for the day: Education is expensive! It will always cost you time, or money, or hard knocks, or all of these.
Thank you all for your input.
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