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| 85 GT Struggling for/Losing Power or Throttle not engaging? (Page 2/3) |
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CZSeventyFive
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JAN 07, 03:27 PM
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Got a guage to check the pressure at idle, at about 31. Not sure how much can be told at idle, revving it didnt change it really.
Its parked in a garage at the bottom.of a snowy, I'll plowed hill so I dont think I'll have much luck getting it up until some of it goes away. So I have this to start. I'll try to attach a picture to this post. 
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Patrick
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JAN 07, 03:49 PM
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Skybax
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JAN 07, 06:49 PM
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Since your focus has been mainly on fuel delivery, nobody has mentioned ignition... I would suggest putting a new coil on it because its easy and cheap, a bad coil will often do what you describe (run but engine falls on its face when put under load). A good quality replacement coil is a Standard Blue Streak and they cost about $30, if it turns out to not be the coil, then you can keep your good old coil in the trunk as a backup. (note: be gentle with the connectors and wires going to the coil and make sure they are fully seated)
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CZSeventyFive
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JAN 08, 12:42 AM
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| quote | Originally posted by Patrick:
How quickly does the fuel pressure drop when the engine is turned off? |
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I would have described it as moderate to moderately quickly IIRC. If it's low at idle then I suppose driving it would have also been rather out of spec. Though I should still get those numbers too, when possible.
| quote | Originally posted by Skybax:
Since your focus has been mainly on fuel delivery, nobody has mentioned ignition... I would suggest putting a new coil on it because its easy and cheap, a bad coil will often do what you describe (run but engine falls on its face when put under load). A good quality replacement coil is a Standard Blue Streak and they cost about $30, if it turns out to not be the coil, then you can keep your good old coil in the trunk as a backup. (note: be gentle with the connectors and wires going to the coil and make sure they are fully seated) |
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I'll look into it. A while back there was a point where when trying to start it the car it would turn for a couple seconds before going, but then that just stopped one day and hasn't occurred since.
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Patrick
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JAN 08, 01:01 AM
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| quote | Originally posted by CZSeventyFive:
I would have described it as moderate to moderately quickly IIRC.
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The pressure should hold steady for at least several minutes before dissipating. I suspect you've either got a leak within the tank (the flexible hose connection to the pump) or one or more of your fuel injectors are leaking.
I suppose it's also possible that the fuel pressure regulator diaphragm could be leaking. I haven't had experience with that myself, but I do recall reading here in the past how to check for that.[This message has been edited by Patrick (edited 01-08-2022).]
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CZSeventyFive
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JAN 14, 11:40 AM
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| quote | Originally posted by Patrick:but I do recall reading here in the past how to check for that.
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Maybe this thread? I'm reading through it and seems to be detailing a similar issue, plus what appear to be some testing methods. I suppose I'll try some of these. I will admit when I replaced the FPR shortly after I bought the car (on the suggestion of the previous owner, who thought it was causing a high idle, though in reality I think the idle was just due to bad gaskets) there was a troubled installation, likely due to my own inexperience (first car I've tried to really "work on," per say).
Namely, when taking the old one out one of the small torx screws stripped/broke, and I ended up drilling out the remains and widening the hole in the rail to accommodate a slightly larger screw (we didn't think we had much of a choice given how it was). Then I installed the parts in the wrong order (the circle plate went under the top hat shaped cap instead of over it, which of course is to hold it down. Pretty moronic, yes I know). I realized it pretty quickly and went back in to put the parts right, but I've since wondered if something else got damaged as a result or if the regulator simply hasn't worked since then (though again, I find it weird that it drove fairly effortlessly after a pump installation, but who knows). So really I may have broke it pretty early.
But I'll follow this thread I linked a bit and see what comes of it, if anything.
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CZSeventyFive
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JUL 09, 01:00 AM
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Something of an update finally as I had some time this week. The car ended up getting parked in a garage and blocked by a nigh unmovable safe. My solution too this, while I wait until it can be moved, is to just check the injectors and just eyeball them, look to see if they're corroded, evidence of leaking, etc... There is some apparent "shine" in the little crevices, maybe it's old fuel? I'd check more but removing the fuel rail has turned out harder than Chilton's or videos make it out to be. Here's a picture, but I'm pretty sure everything that's connected to the rail is disconnected. I read a few older threads, some mention just prying it out but I'm not certain how good that is on whatever the screwdriver ends up pivoting on. Wood wedge simply broke. I'm wondering if maybe, due to the angle the injectors are in there, is there one that can be sorta half disconnected from the rail and maybe allow the thing to pop out? Also taking some time to try and actually clean out a lot of the muk in this thing. I may replace the injectors regardless, though if I get them out I may post a picture to see if anyone thinks anything of the quality.
Also removing this line and it popped this whole little 'thing' out. I've never seen that happen before. Bad? Not really an issue as long as it pops back in (it does)?
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A_Lonely_Potato
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JUL 09, 03:10 AM
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| quote | Originally posted by CZSeventyFive:
Also removing this line and it popped this whole little 'thing' out. I've never seen that happen before. Bad? Not really an issue as long as it pops back in (it does)?
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That is the PCV valve. Its supposed to be removable to my knowledge. The line should run to a port on your TB or upper intake, i can't remember which.
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CZSeventyFive
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JUL 09, 09:43 AM
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Oh okay. I've remove the line from the valve before but I've never had the valve come out with it before, so I wasn't really sure. Thanks!
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CZSeventyFive
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JUL 14, 01:34 AM
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Popped out the fuel rail, checked one of the injectors before having to skedaddle. They really don't look that bad, I think. Seem pretty clean. Some corrosion on the outside, but the tips/ends look good (well, again, I haven't checked all of them). No noticeable sign of leaks. Gave me a good chance to clean under the fuel rail though. Tons of debris. I pre-emptively ordered new (reman) injectors anyways, in case they were all junked looking. I guess I'll just clean up the engine for now.
The pair of fuel lines attached to the little pressure nozzle block, they did look kinda funky, didn't take a picture though. I need to replace those little rubber washers on them since they were disconnected, right? Thought I read that somewhere. Any old auto parts store should have them (or something similar? Not sure how universal they are).
Edit: Actually, int he first pic, the top one looks a little sus, right under the thickest ring. When I go back I'll have to look at that one more closely).[This message has been edited by CZSeventyFive (edited 07-14-2022).]
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