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1993 4.0 No Start

Discussion in 'Stock 1991 - 1994 Explorers' started by LG57, November 29, 2018.

^^Searches ExplorerForum.com^^





  1. LG57

    LG57 New Member

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    I'm new to the forum. I have a 1993 Sport 2wd 5-speed. I'm trying to resurrect it after sitting for 17 years. So far, no start. Here's the things I've done so far:
    1. Pull gas tank, clean and new fuel pump
    2. New fuel filter. Air filter, PCV valve
    3. New spark plugs, plug wires, coil pack
    4. New battery cables
    5. New starter solenoid
    6. New starter
    7. Clean throttle body
    8. Compression test-all 150 to 180lb.
    9. Verified fuel to fuel rail, but not pressure
    10. Ran code reader KOEO--no codes
    11. Checked Elec dist box for loose corroded wires--nothing found
    12. all fuses good
    13. Switched relays around

    After all that, it seems to be trying to start, but maybe only hitting on one cylinder and won't go ahead and light off.
    What would you try next?

    Oh, also unplugged and reconnected crankshaft position sensor.
     
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  3. LG57

    LG57 New Member

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    One more thing. Today when I was cranking it with ignition on checking spark with all plugs out, only #4 was pushing out a mist of fuel. Bad injectors??
     
  4. Exploring XLT

    Exploring XLT Elite Explorer

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    Sounds like it, I would check your fuel pressure and test the injectors
     
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  5. LG57

    LG57 New Member

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    Ok. I'll get a fuel pressure gauge and check it. Then pull the injectors for a cleaning/inspection. Thanks for your reply.
     
  6. LG57

    LG57 New Member

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    Small update this morning. Fuel pressure is ok at 35psi. Now I'm starting the tear down to get at the injectors.
     
  7. roscoe 0202

    roscoe 0202 Active Member

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    there is a plug by the battery two 10 guage wires black two go to the battery terminal two go to the computer pull it apart and clean back probe to make sure it is passing electricity
    roscoe

    this is the computer ground
     
  8. MrQ

    MrQ Fuel Pump Replacer Elite Explorer Moderator Emeritus

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    Injectors are most likely the issue, with 17 year old gas sitting in them I'm pretty sure they are clogged if not destroyed all together. Fortunately these injectors are relatively cheap and very reliable. If you want to save some money and grab some off a junkyard explorer they will probably be good. Regardless of the route you take, MAKE SURE that the injectors you get are for a '93! '91-'92 injectors will not work as the computer uses a different pulse width for those years.
     
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  9. LG57

    LG57 New Member

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    Thanks for the info guys. I'll check those connections. Also, do you know the resistance value for these injectors? I plan to check them when I have them out.
     
  10. LG57

    LG57 New Member

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    Got the injectors out a little while ago. All check 16 ohms, so the coils are good, there is no reaction at all when 9 volts is applied. Looks like they are stuck solid and have heavy hard varnish on the tips. I rigged up a cleaning setup per a utube video, can't get anything to spray through using Berryman carb and choke cleaner. I think I'm just going to find another set of injectors. There's a cheap set on Ebay. Anyone have experience with those?

    Continuing to mess with the injectors, let them soak in the Berryman on the inlet side and now can hear them clicking, Will just let 'em soak some more and see what happens.
     
    Last edited: December 2, 2018
  11. massacre

    massacre Elite Explorer

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    If they are clicking then that is a good,sign. They might free up with longer soaking. Did you remove the little screens?
     
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  12. LG57

    LG57 New Member

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    Update today. Five of the six injectors are working now after soaking. The sixth just won't free up. So I ordered a replacement. I should have all the parts to put the top of the motor back together by Thursday. Will give another update as soon as I get it together. Thanks for the help so far.
     
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  13. LG57

    LG57 New Member

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    I'm elated!!! Success! After reinstalling the injectors and the rest of the top of the motor, It started and ran after being dead for 17 years! Had a lot of clattering at first till the lifters pumped up, but then ran smooth. Has good oil pressure, alternator is working and no warning lights. Then was able to drive it just around our little circle in front of the house. The front brakes are dragging, but has some pedal. Also the clutch seems ok.
    Now on to more repairs on the rest of the truck. I've ordered new front calipers, rotors, pads, bearings, brake hoses and master cylinder. After that, I'll check the rear brakes.
    I'll be back after more progress. Thanks for the help so far. This is going to be quite the restoration project.
     
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  14. LG57

    LG57 New Member

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    Well, I'm back with problems. Engine starts fine every time. But idles slightly rough. At near 2000 rpm it's really rough and hesitates and misses, has no power when the throttle is floored. It will eventually rev on up, but still missing. I ran the code reader both engine off and engine on and get no codes. Engine light is not on. So, suggestions. Remember this is with all new ignition components, fuel pump and filter. Also, five of six injectors were cleaned by me and the sixth was replaced with a rebuilt one. Maybe still bad injectors? Throttle body has been cleaned and MAF cleaned.
     
  15. MrQ

    MrQ Fuel Pump Replacer Elite Explorer Moderator Emeritus

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    Fuel filter. If the tank hasn't been cleaned out in 17 years and you put new gas in it whatever deposits in the tank might have broke loose and got in the lines.
     
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  16. LG57

    LG57 New Member

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    Forgot to say that the fuel tank was pulled, and then cleaned. The old gas was completely gelled and had corroded the fuel pump and level sensor to DEATH. Filter was replaced at that time also. Fuel pressure tested at 35 psi at idle after that work.
     
  17. MrQ

    MrQ Fuel Pump Replacer Elite Explorer Moderator Emeritus

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    I am surprised with your issues you are not getting any lean codes. Anyways, I ran into fuel issue with my second gen with crap in the tank. Even after replacing it I still had to replace the fuel filter a couple of times after and stuff was still coming loose in the lines. Easy way to check is pull the fuel filter and tap the inlet on a piece of cardboard and try to see if anything comes out. I have seen all sorts of crap come out of those things.

    I also just noticed you are right around where I live. :D
     
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  18. LG57

    LG57 New Member

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    Here's an update today. Tested Fuel pressure and it was 30 at idle. Punch the throttle and it goes to 40 then drops back to 30. Pulled the vacuum line off the pressure regulator and pressure goes to 40. Pulled the fuel filter and did find some fine trash, so installed a new one. No change in fuel pressure after that.also installed a new relay for the fuel pump. Still no change. When the throttle is punched, there is a big hesitation, then it revs up but is running rough and power is down.
    What's next? I'm thinking replace the injectors. What do you think?
     
  19. MrQ

    MrQ Fuel Pump Replacer Elite Explorer Moderator Emeritus

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    Only other thing I can think of would be vacuum leak.
     
  20. LG57

    LG57 New Member

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    Ok, I'll go over it again. Would carb cleaner sprayed over it be the thing to use?

    Update: Went over everything and found no disconnected or broken/cracked vacuum hoses, then sprayed carb cleaner over everything at idle and didn't notice any change in idle speed.
    Not sure what next. Still thinking to replace injectors.
     
    Last edited: February 14, 2019
  21. kmack

    kmack Active Member

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    Does it run rough all the time (cold & hot), or does it change based on the engine temp.? Have you checked the thermostat? Hoses? Water pump? What about the temp. sensors (both of them)?
    The temp sensor that sends info to the computer could cause the engine to run rough. Mine does that periodically after a warm/hot start.

    Also, what condition is the exhaust in after 17 years? Is it clean/clear? No obstructions? CAT condition? Who knows what could have crawled up there and died in that long of a time frame!

    You said you cleaned 5 of the injectors... How was the spray pattern after cleaning? Did you compare those to the spray pattern of the new one you bought? That could also have an affect on engine performance.

    Just more stuff to think about. You done a lot so far and have brought an Ex back from the dead! Congrats! Don't give up now...
     
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