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Author Topic: Misfire  (Read 936 times)

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Enceladus

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Re: Misfire
« Reply #15 on: 16 November 2019, 06:34:12 »

Six point sockets will fit nicely on some of those TX spline head bolts. Just don't try it with a 12 point.

Since you don't have a 1/4" drive E10 and the bolts are not done up particularly tight, you could try using a six point socket. Can't remember exactly which size it might be, possibly 8mm, 9mm or 10mm? Should be easy to check since you have at least one bolt out.

I am not sure you need a 1/4" drive wobble bar. If an extension is needed, I think the screws can be removed with a standard short extension and 1/4" drive socket. Perhaps a deep (long) 6 point socket is all you need.
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Diamond Black Geezer

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Re: Misfire
« Reply #16 on: 16 November 2019, 20:27:54 »

I just get whatever cheap 1 black sillycone I can find, seems to work fine (says the man that's just had to change his DISpack this week because of a scuttle leak  ::) ahem...)

Keep the faith, and we're here if you need us  ;)
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JohnM

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Re: Misfire - update, dis pack off
« Reply #17 on: 21 November 2019, 15:58:41 »

I knew Halfrauds would let me down, but I'm big enough to give them another try.  Another visit of; is it in the cabinet and we ought to sell them and here's one on a 3/8" ...
To give them there due, they did try properly this time.  And, another outlet I found who could order me in that E10 and wobble bars decided after the weekend they couldn't !!
Anyway, sorted days later with Mr Amazingly Prime.  The wobbles aren't what I wanted (plus type that lock) but this thing is off.
- Had to release the wiper motor though, it wasn't for the coming out.

The dis pack looks fine.  No visible corrosion about, no splits or cracks anywhere.  Quite clean too (all that water ? :o )
Trying to post a pic (but seem to have forgotten how to on this board - I'll work on it).

QIC267/RB8046A - is that really its GM part number ?

Options?  Must be new/take a punt on TB's favourite shopping site/regular motor factors/dismantlers ??

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JohnM

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Re: Misfire
« Reply #18 on: 22 November 2019, 11:31:15 »

Could someone have a look at the pics of my dis pack and work out which one I need as a replacement.

I really can't find any other numbers on it other than the QIC267 reference.
Is it even a genuine GM part?

https://photos.google.com/share/AF1QipP3-q4FPw842TaiXM7ZssSi37QvhAKlz2q3IX0m9RRf8qHgQ7xb_dBp8waoqsU3Yg?key=c1VhQzNFVldOeFVmS25DQ3BtU1pEczNPbmV1OERn

The one on the green mat is probably the most useful.
« Last Edit: 22 November 2019, 11:42:54 by JohnM »
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Enceladus

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Re: Misfire
« Reply #19 on: 22 November 2019, 12:04:17 »

You need a Bosch 0​ 221​ 503​ 017 (0​221​503​017), GM part # 90541062. I suspect the one you have now is not an original.

Have you checked the plug leads?
« Last Edit: 22 November 2019, 12:15:47 by Enceladus »
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JohnM

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Re: Misfire
« Reply #20 on: 22 November 2019, 12:12:30 »

You need a Bosch 0​ 221​ 503​ 017 (0​221​503​017). I suspect the one you have now is not original.
Thanks.  Is there a VX p/n ?

Have you checked the plug leads?
No - other than they are (were) connected.
Should I remove the rest (6 & 4 are on the garage floor) and meter them ?
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Enceladus

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Re: Misfire
« Reply #21 on: 22 November 2019, 12:26:21 »

GM part # 90541062
Try and buy a genuine Bosch part. The third party makes can be unreliable and short lived. Although I might take a punt on the Lucas version, if I couldn't find a Bosch at a reasonable price.

Also I don't know if they're is any real way to test the coil packs, it needs a specialised setup that probably only existed at the Bosch factory.

Uusally there is some evidence of failure. Melting on the case or cracks etc. Yours seems to look OK. But can still be failed.

I would check the leads with a multi-meter. Not definitive but better than no test. The resistance specs are in the Haynes manual, I think. That said the leads are usually more reliable than the coil packs, providing they're properly pushed home when disturbed.
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cam.in.head

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Re: Misfire
« Reply #22 on: 22 November 2019, 12:55:32 »

hi. from what i can remember when i changed my brothers 2.5 coil last year i did find an abnomality with a test meter.
the input connector has 4 pins.one of them is a common( one of the end ones !) and should have 3 equal resistances in turn to the other 3 pins.  mine did ..   this is the primary side and will most likely be ok.
the secondaries are in pairs and i seem to remember there being a circuit(albeit very low resistance)between two sets of studs but nothing on the others .or it could have been to the connector common and one output was missing .either way something stood out as being different or missing on one of the output studs .
the new replacement coil was checked in the same way and gave equal readings to all the studs as it should.
so your coil may be intermittently breaking down or tracking which may well test ok with a test meter but if you find a major abnomality like i did then you know for sure.
mine was missing on cylinder 3 only. no spark was coming out of it even thou the other correponding output was working.
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JohnM

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Re: Misfire - Friday update, something new
« Reply #23 on: 22 November 2019, 21:50:09 »

Thanks Enceladus for the prompt:  I pulled the 135 banks leads to measure them - they'd been left in place.

Oh.

I've found at least one fault. Lead #1 was wet around the seal and the well had some water in it, lead #3 seal was also wet and the well was full of water (that wasn't going to help the HV) - syringed all out into a jar, looked fairly clean water (I knew we drove though some rain, but).
Leads caps for 5 and all of the 2,4,6 were dry.
Pulled all the plugs in turn, all had some rusty water marks on them.
All cleaned up, look quite servicable now (photos on phone). Popped back (untightened) to secure the holes.

Quite how that well filled with water I'm unsure - no leads appeared loose. I'll have to double-check cap 3 for splits or something in the next session in the light.  Need to continue with measuring the leads resistance as I've only finished 2-4-6 ones before the dark/rain.

So given that water, now cleared, and I'll be sealing the screen somehow, prace bets on the dis pack living and it all going back together as is.  Need some o rings first mind.
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Doctor Gollum

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Re: Misfire
« Reply #24 on: 22 November 2019, 23:50:01 »

The scuttle is sealed by making sure the parts are correctly fitted... ie without sealant  ;)
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JohnM

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Misfire - UPDATE
« Reply #25 on: 08 December 2019, 14:19:57 »

... prace bets on the dis pack living and it all going back together ...

What, no takers? 

Well it went back together right (okay, I'll admit not connecting the IACV power).  The mis-fire was the same.  DC testing the coils had looked good and consistant and physically also looks good (beware buying seconds!).  So ordered a new, bosch pack (not too horrific) and set about doing it again.

New pack (took a while to arrive), all restored (one or two niggles) and today she runs (on all pots).  As it is nice and dry, took her for a spin (sans wipers, scuttle and a few oddments) to prove, and she's back to her previous self.

Many thanks all.  New posts for next work.
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