Electrical problem! (Full Version)

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Electrical problem!

  

irwinbdi -> Electrical problem! (4/2/2007 1:40:59 PM)

OK. Now this is very strange...

With the key in the 'on' position I can hear at least four things intermittently. The first thing is the fuel pump goes on and goes off, on and off. The second is the throttle positioner behind the throttle body starts to move in and out and the fuel injector intermittently starts shooting fuel down the throttle body, also, I hear poping from the distributor cap... What in the world is going on? I experience this every time I move the ignition switch to the 'on' position. I left the ignition switch 'on' for 10 minutes and these things continue to happen intermittently.

Is this a shorted computer? Bad ground?

HELP!

  
detroitmi -> RE: Electrical problem! (4/2/2007 2:10:49 PM)

Before we even try to diagnose this we need to slow down a bit. The TPS (throtle position sensor) should not make any sound at all, it's only a sensor, no moving parts. (though it's possible your cruise control motor is cracking the throtle plate open for some reason).

How does the Escort run after starting?
Are you having any other troubles aside for things clicking?
Just things going on and off when the ignition is on does not indicate a problem, it could be a simple program of the computer to turn certain solenoids on and off whith the engine off.

irwinbdi -> RE: Electrical problem! (4/2/2007 3:38:45 PM)

Thanks for the reply detroitmi.

Yes, this escort does have a cruise control. I guess it is the cruise control motor that is moving the throttle plate open and closed.

I can't get the escort to run. It will turn over just fine. It is getting a spark. It appears the CFI is dumping way to much fuel into the throttle body and is flooding the engine out.

The weird thing is...is that all of those things I mentioned in my initial post happen when the ignition key is in the 'on' position. It is my understanding that only the fuel pump should power up for a few seconds to pressurize the fuel system. Is that correct?

The single injector shouldn't dump fuel into the throttle body for 10-15 secs... Its just flooding everything!

I hear poping from the distributor cap, also.

All of these things are intermittent. They last any where from 2-3 secs or 30 secs. There is no distinct pattern.

Thanks again for you assistance!

Brian

goinstrong -> RE: Electrical problem! (4/2/2007 5:20:33 PM)

First - try cleaning and checking the battery cables and terminals for a bad major grounding problem. Then look for a crossed wire or blown fuses. The injectors should definitely not flow fuel at least until the key is turned to start. Is the ignition switch original?

goinstrong -> RE: Electrical problem! (4/2/2007 5:21:56 PM)

Way back my '88 Mustang had an ignition switch recall (that's why I asked).

irwinbdi -> RE: Electrical problem! (4/2/2007 5:47:54 PM)

The battery terminals are clean and secure. The grounds look good. No blown fuses. As for the ignition switch...The car is new to me. The switch looks original.....

irwinbdi -> RE: Electrical problem! (4/3/2007 10:03:41 PM)

Hi guys,
Well, here is an update:
I replaced the battery cables and one questionable fusible link. I replaced the ignition electrical switch.
Still no change... Same weirdness.
Looks like I need to get another ECM!?
Anyone else have any thoughts?????
Brian

goinstrong -> RE: Electrical problem! (4/3/2007 11:36:26 PM)

It's like the computer thinks the engine is running - so it's dumping fuel and firing and doesn't know it's going nowhere. It almost sounds like a wire is crossed. I wish I were there. I could figure it out quick being there - I'm not as great at the 50 questions way of narrowing it down sometimes. But - I am persistant. If you replaced a fusible link - did it have light charring/blackness on the wire casing? and what did it connect to (if you know)? What parts tell the computer it is or it's not time to run? - that's the question. If the timing belt is off will it cycle the fuel pump wrong?--NO - it's not running or being started yet. It thinks it's in the run position at the keyswitch - That's it. What parts make it think that? Keyswitch (NOT THAT), ECM (Low suspect),  ---- Power going to the switch making it think it's in the run position - ECM, dash wires, or fuse in wrong place in fuse box - could be wire spliced/fused or burnt into harness wrongly. Definitely not an engine sensor - they mostly regulate running. Look for starter wires on wrongly (just to be sure). Maybe voltage regulator overloading ignition switch circuit - OR Starter solenoid burned shut or wires crossed -that will make it think the key is on run. Usually you can look at an ECM circuit board and see a failure if there is one - if there is another problem though it could have fried it from switching and cycling as it is- either way you can usually see. If it turns out to be bad there are two main things that can kill one. 1 - tight enclosure and high cabin temps 2 - water/coolant leakage in the mounting area

enibum -> RE: Electrical problem! (4/4/2007 4:15:36 AM)

Hi Brian. I have some literature for you to read. Maybe it will help you, I hope. The injector gets it's signal to fire from the ECU in what are called pulse width signals. These signals are generated from motor rotation that is detected by sensors that monitor the rotation of the cam or the crank shaft. The faster the pulses from the sensors, the faster the signal to the injector. I am curious about the noise you are hearing from the distributor. It could be causing these pulses to be picked up by the ECU and translated into motor rotation. Therefore pulsing the injector. With the injector spraying fuel the pump has to run to keep pressure built up. Anyway, this is just a theory and I hope it helps. Here is the literature I promised you. Be sure to use the next--> button at the bottom of the page so that you can get to the next page. Good Luck.

http://auto.howstuffworks.com/fuel-injection3.htm

goinstrong -> RE: Electrical problem! (4/4/2007 3:12:51 PM)

A short picked up by the sensor. That's a good idea. Have you ever had an antifreeze spill or leak? It can invisibly (except at night sometimes) short wires across each other. Water and wipe some wires off if they have a suspect coating like a dried/pale look to the wire casings (dried antifreeze).

  

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