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Old April 14th, 2014, 07:11 PM   #1
jeepxj2007
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Default Ford 4.9 i-6 issues

I am stumped and hoping someone has some idea where to look. This morning I jumped in my beater truck (1995 F150 4.9l I-6 manual 4x4) and it started like usual. It ran for about 15 seconds and died. It ran really rough for 1/2 a sec before dieing.

It currently turns over. I replaced the fuel pump with a new one from Napa last summer and repaired a junk yard tank and flushed it out very well. When I turn the key forward I hear he pump kick on like usual.

I pulled the front cylinder plug and wire and it definitely has spark to it.

I checked fuel at the Schrader valve several times and it sprayed out and while someone rolled the engine over it was like a fountain coming out so it seemed like a lot of pressure.

When I pulled the plug it was wet with fuel so I would assume the injectors are actually putting fuel into the cylinders.

I even messed around swapping the relays under the hood and testing them with the horn and all worked with the horn but didn't make a difference under what orientation.

I have never had this happen. I am stumped as to where to look with it. Any suggestions? Thank you!

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Old April 14th, 2014, 07:31 PM   #2
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You need to verify your fuel pressure with an actual gauge. It may seem like it has enough, but it could be just shy.

It also could now be flooded, so keep that in mind.

Report back with fuel pressure results, also, pull codes using the self test method to see what the truck has to tell you - follow this link if you're not sure how: http://broncozone.com/topic/14269-co...er/#entry74587
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Old April 14th, 2014, 07:58 PM   #3
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Get the plugs cleaned off, pull the coil wire off and crank it a few times to clear the cylinders, could put a little oil in the cylinders that the plugs were wet on in case there was enough fuel to wash the cylinder but not necessary. Maybe just replace the plugs and do a full tuneup if needed.

You said you have spark but like said above get a fuel pressure gauge and check that, then double check the spark.

With new or clean and dry plugs in try starting fluid to get it running, pull the fuel pump fuse first. If it starts on the fluid then put the fuse back in and try it.
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Old April 14th, 2014, 08:13 PM   #4
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I wouldn't spend the time or money on a "full tune up" as stated until you know what is really going on in there
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Old April 14th, 2014, 08:50 PM   #5
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I will stop and get a gauge tomorrow. I'm not quite seeing how it would be that low on fuel pressure to not even attempt to fire. I see people mention putting a little gas in the cylinders or starting fluid and get it to fire for a second. It had fuel on the plug two different times when I pulled it. Not quite sure what to think here it ran fine Friday when I parked it and it sat over the weekend. I'm not sure if it is a coincidence with the humidity and all the rain. I would assume it would be a no spark situation though if it was messing with the ignition system.

Earlier when I got home I was messing with it for a while and the motor stumbled twice at different times like it was about to try to fire but wouldn't.

I will grab a gauge tomorrow and check it out though and see what it actually has for fuel pressure and try the self test as mentioned.

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Old April 14th, 2014, 08:54 PM   #6
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Could be a stuck injector or many other things.

Try starting fluid first but take fuel pump fuse out.
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Old April 15th, 2014, 07:52 AM   #7
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Start with a compression test, last time I worked on a 4.9 it had similar symptoms and turned out to be a broken cam.
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Old April 15th, 2014, 02:16 PM   #8
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I stopped and bough fuel pressure test kit. With key forward every time from off I was able to get 52 pounds of pressure. With turning it over I was able to get 52 and one time 55. From what I gathered researching 45-60 was a range to see but 50-60 pounds was ideal.

I ran the self test on the ECM. I came up with codes 116, 114, and 522
With the research I came up with:
116 ECT sensor is out of Self-Test.
114 ACT sensor is out of Self-Test.
522 Vehicle not in PARK or NEUTRAL during KOEO. (I was on a hill so I left it in first.)

114 and 116 seem to be a very common error code when cold and not so much to do with the engine unless it was up and running and also warm. I just found that a few places googling it.
I am unable to perform a test while it runs since it wont start.


For compression I tested cylinders 1 and 6 because I would figure if it was not starting due to a broke cam or timing chain it would show up at either the first or last cylinder.
Cylinder 1 had 130 P.S.I
Cylinder 6 had 130 P.S.I.

I'm still stumped as to what would cause this all a sudden. When I pulled plug 6 it was wet with fuel as well as plug 1.
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Old April 15th, 2014, 02:32 PM   #9
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I would guess 114 and 116 were due to temps, and anyway neither should prevent a start.

Well, you've got fuel, you've got compression, only thing left is a good spark. Could be a weak coil? I would check plug wires for arcing, etc. Check Distributor cap for moisture, etc.

I know you said you saw spark on one wet plug, but I'd investigate further to ensure you've got good spark all the time.
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Old April 15th, 2014, 02:40 PM   #10
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That's what Im starting to wonder. I took the plastic tubes from the air box to the throttle body off and tried with and without the fuel pump relay and opened the throttle body manually to spray starting fluid in on 3 different attempts. It didn't even make the engine stumble at all or any difference. I would imagine if any sufficient spark would be present it would of stumbled a little bit trying to fire. I will wait until my help gets here and check for spark again. I checked it twice yesterday and could visibly see it.

I started thinking I never wiped the plug dry the one time when I put it to a ground and had someone turn the engine over. It had fuel on it but I never seen any of the fuel on it ignite. Im curious now if the spark isn't strong enough.
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Old April 15th, 2014, 02:41 PM   #11
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I agree.....check for a good spark......should be able to jump 3/4" gap in free air, check at a couple different plug wires
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Old April 15th, 2014, 03:19 PM   #12
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The compression test of only 1 and 6 isn't conclusive, but looks promising.

When I found the broken cam in the one I worked on I had already lost my ass on that job chasing the "usual" suspects. I decided to do a compression test and got really wonky results, I can't remember the specifics, but it was a mix of normal and low PSI cylinders. I ended up discovering this was due to the cam after I took the rocker cove off and noticed that roughly half the valvetrain wasn't moving during cranking, lol.

Other than that the 4.9s were so good mechanically, I rarely ever worked on them.
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Old April 15th, 2014, 03:28 PM   #13
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It should really be able to jump that far? It sparked between the electrode and ground strap but wasn't real impressive or even seemed powerful enough to be able to jump any further than the spark gap itself. I have notice lately the gas mileage has been getting worse and worse for having the same driving habits as in the past. I have always heard that coils and the dist hate moisture and it rained here very heavily lately and was humid when it happened.

I do see the importance of a compression test but with fuel and somewhat of a spark at 1 and 6 I would expect something... a misfire or anything. The motor does absolutely nothing but turn over.

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Old April 15th, 2014, 03:28 PM   #14
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check the connection on the coil,the 2 primary wires are know for corroding, give them a slight tug and see if they hold
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Old April 15th, 2014, 03:36 PM   #15
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The only time I encountered moisture problems, the engines would always start and idle, they were just weak and missed all over the place when you tipped into the throttle.

I agree.. I also think you should get some type of crackle or pop when cranking, not getting anything seems odd if you have spark and fuel.
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Old April 15th, 2014, 06:22 PM   #16
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I finally got the truck to run. I threw a new coil in it and it fired right up. I thought it was somewhat odd out of the blue it just completely killed the truck but hey I wont complain it runs now. It was in pretty bad shape the metal ring around the outside that the mounting bolts go through were extremely rusty and nasty looking.

I appreciate everyone's advice!
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Old April 15th, 2014, 06:27 PM   #17
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Nice.
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