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Bronco man
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Mar 24, 2011, 3:51 AM
Post #1 of 41
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Engine won't fire
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i have a 1994 Ford Bronco 302, 5L engine 310,000 miles, was running fine i parked it went to the store cam out and it wouldn't start, i could hear the fuel pump pressure up but no fire, no warning light flash... nothing. Can you give me a place to start my trouble shooting?
Thanks
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Hammer Time
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Mar 24, 2011, 3:52 AM
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Re: Engine won't fire
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All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.
Every engine requires spark, fuel and compression to run. That's what we have to look for.
These are the basics that need to be tested and will give us the info required to isolate a cause.
1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.
2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.
3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.
4) If all of these things check good, then you would need to do a complete compression test.
Once you have determined which of these functions has dropped out,
you will know which system is having the problem.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Bronco man
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Mar 24, 2011, 4:30 AM
Post #3 of 41
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Re: Engine won't fire
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Thanks Hammer Time,
I will follow your steps and see what we come up with.
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Tom Greenleaf
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Mar 24, 2011, 6:55 PM
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Re: Engine won't fire
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Not if but when was the timing chain replaced? They don't last that many miles. Compression would be low to zero and perhaps even the rotor in distributor wont turn now if it really went out,
T
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Bronco man
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Mar 26, 2011, 12:48 PM
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Re: Engine won't fire
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HammeTime, I pulled the codes and got 116 Coolant temp sensor out of range and 636 Transmission temp sensor out of range would any of these keep it from starting?
Thanks
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Hammer Time
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Mar 26, 2011, 1:13 PM
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Re: Engine won't fire
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Let me know when you've finished with the tests i requested.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
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Mar 26, 2011, 1:23 PM
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Re: Engine won't fire
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Bet Hammer took a day off from this stuff as he works hard and works hard here. CTS is to adjust how much fuel gets delivered based on engine temp. If and codes don't mean just toss that item that was bad it could deliver way too much fuel or way to little when cold. Way too much it would likely start and run terrible - perhaps so much extra fuel it would flood it, if way too little, priming throttle body it would still react and perhaps stay running and when warmed up should run normally even with a bad one IMO.
Doubt trans temp is more than a warning of sensor or connection and would prevent it from starting and as just said CTS would make it run lousy or flood.
You need to go thru the list he provided and MAY/SHOULD check connections and replace these items but IMO you would have normal spark with either wrong. Check a spark plug too and see if it's soaked. Very wet with gas plugs can prevent it from starting.
Still need to go thru that list of checks,
T
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Hammer Time
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Mar 26, 2011, 1:35 PM
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Re: Engine won't fire
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We would have gotten to that point if he performed the tests I asked.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
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Mar 26, 2011, 2:16 PM
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Re: Engine won't fire
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So you are live an kicking today
Tom
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Hammer Time
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Mar 26, 2011, 2:20 PM
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Yep, making sure nobody steals my couch and fixin to watch some Nascar.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Bronco man
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Mar 27, 2011, 11:53 AM
Post #11 of 41
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Re: Engine won't fire
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Ok tests where as follows.
Spark is good.
Fuel pressure at the shrader valve on the fuel rail was 40 psi and held with the key off.
I could use a little help with the injector pulse test, i don't have noid light but do have a meter can i use it to do the pulse test? Or should i go borrow a light from the local parts store? Do I unplug the the injector and test the hot lead at the plug?
Thanks for the help.
Bronco M
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Hammer Time
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Mar 27, 2011, 12:08 PM
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The meter is OK to read the power side but it won't respond fast enough to read ground pulse. You can get a noid light for about $5 or $6 or maybe they loan them out.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
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Mar 28, 2011, 4:12 PM
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Quote">> i have a 1994 Ford Bronco 302, 5L engine 310,000 miles,<<"
As I said - original timing chains absolutely don't last that long. Yes check for injector pulse but bet you find valve timing way off and will show even low compression - common,
T
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Hammer Time
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Mar 28, 2011, 4:16 PM
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A compression test is part of what i asked him to do. Let him finish the testing so we can get the whole picture.
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Bronco man
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Apr 9, 2011, 12:22 PM
Post #15 of 41
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Well finally completed the compreisson test the results were all eight cylinders were 100 psi plus or minus a couple because the pressure gauge was the old hand held kind. What do you think?
Thanks
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Hammer Time
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Apr 9, 2011, 12:29 PM
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Apparently you're back to square one and starting over. You just told me it passed all tests and if that were really true, the car would be running. There is something wrong with your test results somewhere.
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Bronco man
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Apr 9, 2011, 2:19 PM
Post #17 of 41
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Its got to be the spark thats the only test i didn't witness personally, i will go back and check again.
Thanks
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Hammer Time
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Apr 9, 2011, 2:22 PM
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You need to make sure it's a strong spark that can jump at least 3/8". Using an adjustable spark tester is the best way.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Bronco man
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Apr 10, 2011, 6:40 PM
Post #19 of 41
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Re: Engine won't fire
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Ok i got a spark tester hooked it to the coil wire at the distributor got nothing, checked volts to the coil had 12V i replaced the coil and same thing. I checked the coil wire resistance and got 6 ohms, is it my coil wire?
Thanks
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Hammer Time
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Apr 10, 2011, 6:44 PM
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No, you're not getting trigger ground to the coil. It's probably a bad ignition module assuming you have injector pulse which you said you checked.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Bronco man
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Apr 10, 2011, 7:17 PM
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Yes pulse test was good, ignition module i assume its in the steering column where the key goes to start the truck? if so doesn't supprise me my ignition switch is pretty worn out.
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Hammer Time
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Apr 10, 2011, 7:25 PM
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No, it's mounted on the fender well. It should have have more testing before changing it.
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Bronco man
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Apr 10, 2011, 7:30 PM
Post #23 of 41
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Re: Engine won't fire
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Will you walk me through testing it?
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Hammer Time
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Apr 10, 2011, 7:32 PM
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You can't. Bring it to an AutoZone and they should be able to test it.
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Bronco man
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Apr 10, 2011, 7:39 PM
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Thanks i will do that, it scared me at first, i looked it up in my chiltons and it showed an ignition module in the distributor. Is what i'm looking for called EEC-IV module?
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