Re: '88 LX 5.0 not running after sitting (long)

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CarGuru > Ford > Re: '88 LX 5.0 not running after sitting (long) 22 February 2006 20:36:39

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Re: '88 LX 5.0 not running after sitting (long)
The other Donald 26 March 2005 18:21:35
	"JS" <not@home.now> wrote in message news:g%21e.24186$qN3.2098@trndny01...> I have a problem that has me a bit perplexed...> Today a friend of mine and I started up two 5.0 cars that sat in a field the last few months or so, waiting for the spring thaw. Both cars are as The way it is running (so to speak) sounds like a weak coil. I have seen most of the symptoms you described on a number of cars: won't rev, idles okay sometimes, back firing (I've never heard it called after firing), missing, etc. I'd make the coil swap before digging into the spark plugs. -- -Donald in Austin
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Js 26 March 2005 05:35:08 [ permanent link ]
	I have a problem that has me a bit perplexed... Today a friend of mine and I started up two 5.0 cars that sat in a field for the last few months or so, waiting for the spring thaw. Both cars are as stock as you can find 'em, and ran with no problems when parked. The one, an '85 GT 5.0 CFI AOD fired right up after a battery charge. Not a problem. The other, an '88 LX 5.0 SEFI 5-speed, didn't want to run. At all, not cold, not warm, nothing. It didn't need a charge, but immediately upon start up, it sputtered and died. It won't hold an idle. It doesn't seem to rev up at all when hitting the throttle, but pumping it was ok and it would get to almost 2500RPM with a quick 10%-0 repeated pumping cycle. Hitting the throttle to the floor made it just slow to a sure stop every time, like it only wanted to rev when the throttle plate was closing or closed. Backfires or afterfires (not sure if it was burning up in the cats or in the intake) were common during this pumping, especially when going more like 75%-0 continuously. Grabbed some tools and took a look. I didn't have my computer scanning tools, and the '88 didn't have a CEL, so I don't know if it was throwing a code. That's for the next adventure. First, added some dry gas mixed with a fresh couple gallons of 93 octane. Both cars sat the same length of time, but maybe one had questionable gas. This did nothing. Checked all the wires... they're fine and connected. Pulled the cap, and it was a little corroded, so we cleaned it up a bit. Still no change. Pulled the IAC plug, and it actually held a 500RPM idle. I was shocked. By my deductions, it was getting too much air for the fuel it was getting. Putting a fuel pressure gauge on the schrader valve showed 30PSI at this idle, and the number would fluctuate with the throttle, but not drop below 30. I put a timing light on the coil wire at 500RPM, just to see. There was a miss every now and then, showed by the light and the stutter of the engine, but it was fairly constant. Pumping the throttle to rev it up, there were no breaks. Same with using plug wire #1. Even with the full-throttle from 2500RPM, the light never missed, but the engine was slowing fast. Timing at 500RPM without the SPOUT (yes, it ran that way too as long as the IAC was disconnected) was around 14 or 15 degrees, running 93 octane gas. My theories at this point (without a computer scan) are... O2 sensors wouldn't matter because it did this cold, well before the sensors would be used for fuel trim anyway MAF sensor is N/A - this is a speed density car. The only other tools used to map the fuel are the RPM, TPS, and MAP. The hall effect sensor in the distributor could be bad, the TPS could be way off, the MAP could have problems, could be a vacuum leak (though none was heard), or injectors could be plugged. The car hasn't been tuned in a while, so my friend will throw a cap, rotor, plugs, and wires on it... but I have a feeling it won't help. The light shouldn't light unless the plug fires or is shorted together somehow, and the 500 RPM idle was mostly smooth, indicating a fire on all 8. Any other suggestions or things that I'm missing? We have a spare distributor out of a known-good engine, new 19# injectors in a Ford box, and MAP sensors are pretty cheap. I just hate throwing parts at a problem, even if the parts are free. TIA, JS
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Js 27 March 2005 12:58:04 [ permanent link ]
	"The other Donald" <the_donald_13@yeehaw8.com> wrote in message newsde1e.42978$8D.21457@tornado.texas.rr.com...> "JS" <not@home.now> wrote in message news:g%21e.24186$qN3.2098@trndny01...>> I have a problem that has me a bit perplexed...>> Today a friend of mine and I started up two 5.0 cars that sat in a field> for>> the last few months or so, waiting for the spring thaw. Both cars are as> The way it is running (so to speak) sounds like a weak coil. I have seen> most of the symptoms you described on a number of cars: won't rev, idles> okay sometimes, back firing (I've never heard it called after firing),> missing, etc.> I'd make the coil swap before digging into the spark plugs.> --> -Donald in Austin Donald and Mike, Thanks for the suggestion of the coil. After you mentioned this, I remembered a battle I had with an '88 GT that I thought for sure was the distributor, and it turned out to be the TFI coil. My friend swapped the coil with one in a '90 that had worked when we pulled the car apart a few years ago. No help. He went out and bought a new coil, thinking that perhaps that one was bad too, but to no avail. We're still at a loss. I don't think he's had time to get into the plugs due to Easter rapidly approaching. Thanks again for your help, and have a good Easter holiday if you're so inclined. JS
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Ironrod 28 March 2005 11:21:35 [ permanent link ]
	The symptoms sound very similar to what I was experiencing in my 88GT when the fuel pump started going out. "JS" <not@home.now> wrote in message news:wAu1e.44841$db6.16499@trndny02...> "The other Donald" <the_donald_13@yeehaw8.com> wrote in message> newsde1e.42978$8D.21457@tornado.texas.rr.com...> > "JS" <not@home.now> wrote in message news:g%21e.24186$qN3.2098@trndny01...> >> I have a problem that has me a bit perplexed...> >> Today a friend of mine and I started up two 5.0 cars that sat in a field> > for> >> the last few months or so, waiting for the spring thaw. Both cars are The way it is running (so to speak) sounds like a weak coil. I have seen> > most of the symptoms you described on a number of cars: won't rev, idles> > okay sometimes, back firing (I've never heard it called after firing),> > missing, etc.> > I'd make the coil swap before digging into the spark plugs.> > --> > -Donald in Austin> Donald and Mike,> Thanks for the suggestion of the coil. After you mentioned this, I> remembered a battle I had with an '88 GT that I thought for sure was the> distributor, and it turned out to be the TFI coil.> My friend swapped the coil with one in a '90 that had worked when we pulled> the car apart a few years ago. No help. He went out and bought a new coil,> thinking that perhaps that one was bad too, but to no avail.> We're still at a loss. I don't think he's had time to get into the plugs> due to Easter rapidly approaching.> Thanks again for your help, and have a good Easter holiday if you're so> inclined.>
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Clark Kent 29 March 2005 10:42:02 [ permanent link ]
	Years ago my 88GT did this exact thing you describe and I too was at a loss of ideas through process of elemination. I thought I had bad gas and I went through the same things you describe. Anyway to make a long story short, while car was at idle I unplugged the TPS and it ran smooth (at idle) I put a new TPS on and it ran fine. Before it was backfiring through the intake manifold. On Mon, 28 Mar 2005 07:21:35 GMT, "ironrod" <cmuza@worldnet.att.net> wrote: The symptoms sound very similar to what I was experiencing in my 88GT when>the fuel pump started going out.> "JS" <not@home.now> wrote in message news:wAu1e.44841$db6.16499@trndny02...>> "The other Donald" <the_donald_13@yeehaw8.com> wrote in message>> newsde1e.42978$8D.21457@tornado.texas.rr.com...>> > "JS" <not@home.now> wrote in message>news:g%21e.24186$qN3.2098@trndny01...>> >> I have a problem that has me a bit perplexed...>> >> Today a friend of mine and I started up two 5.0 cars that sat in a>field>> > for>> >> the last few months or so, waiting for the spring thaw. Both cars are>as>> > The way it is running (so to speak) sounds like a weak coil. I have seen>> > most of the symptoms you described on a number of cars: won't rev, idles>> > okay sometimes, back firing (I've never heard it called after firing),>> > missing, etc.>> > I'd make the coil swap before digging into the spark plugs.>> > -->> > -Donald in Austin>> Donald and Mike,>> Thanks for the suggestion of the coil. After you mentioned this, I>> remembered a battle I had with an '88 GT that I thought for sure was the>> distributor, and it turned out to be the TFI coil.>> My friend swapped the coil with one in a '90 that had worked when we>pulled>> the car apart a few years ago. No help. He went out and bought a new>coil,>> thinking that perhaps that one was bad too, but to no avail.>> We're still at a loss. I don't think he's had time to get into the plugs>> due to Easter rapidly approaching.>> Thanks again for your help, and have a good Easter holiday if you're so>> inclined.>>
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Guest 22 February 2006 20:36:39 [ permanent link ]
	Try re-setting the fuel pump shut off switch which may be located in the trunk.
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CarGuru > Ford > Re: '88 LX 5.0 not running after sitting (long) 22 February 2006 20:36:39

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Re: '88 LX 5.0 not running after sitting (long)

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