BX 19GT PROBLEM NO MORE!

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Kitch
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Re: BX 19GT PROBLEMS

Post by Kitch » Tue Feb 23, 2016 10:24 pm

Can't say I'm surprised Tim, it's going to be carb related. Still, least it's new now!

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Tim Leech
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My Cars: 1958 ROVER P4 90 UWP 84
1963 VW BEETLE 1200 KGJ413A
1972 Morris Marina 1.8 SDL BFA720L
1979 Rover SD1 3.5 V8-S TSL 982
1980 Morris Marina 1.7HL DBV468W
1985 CITROEN BX 19GT C1TBX
1991 CITROEN BX 19TZI AUTO A/C BXi 19
1994 CITROEN XANTIA 1.8 SXi M908HRY
2003 Rover 25 1.6i XL L33CHT
x 72

Re: BX 19GT PROBLEMS

Post by Tim Leech » Wed Apr 06, 2016 4:27 pm

Carb rebuilt and fitted, new ignition amp, coil and rotor arm also fitted and it's no different.

Dizzy cap ordered.

Intermittent weak spark noticed when warm and plug out.

It's getting fuel, air and the timings fine so must be ignition?

Next stop is a new dizzy?
1963 VW BEETLE 1200
1985 BX 19GT Mk1
1991 BX 19TZI Auto A/C
1994 Xantia 1.8i SX
1972 Morris Marina 1.8 SDL
1979 Rover SD1 V8-S
1980 Morris Marina 1.7HL
2002 Rover 75 CDTi Connossieur SE AUTO Nav
2003 Rover 25 1.6i XL 5 DR

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Kitch
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Re: BX 19GT PROBLEMS

Post by Kitch » Wed Apr 06, 2016 4:47 pm

Unless there's more to this than I know, I genuinely can't think of anything else on that car that could cause the issue, other than the carb. Will it rev up while the auto-choke is in operation?

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Tim Leech
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My Cars: 1958 ROVER P4 90 UWP 84
1963 VW BEETLE 1200 KGJ413A
1972 Morris Marina 1.8 SDL BFA720L
1979 Rover SD1 3.5 V8-S TSL 982
1980 Morris Marina 1.7HL DBV468W
1985 CITROEN BX 19GT C1TBX
1991 CITROEN BX 19TZI AUTO A/C BXi 19
1994 CITROEN XANTIA 1.8 SXi M908HRY
2003 Rover 25 1.6i XL L33CHT
x 72

Re: BX 19GT PROBLEMS

Post by Tim Leech » Wed Apr 06, 2016 5:28 pm

stupid double post
Last edited by Tim Leech on Wed Apr 06, 2016 5:40 pm, edited 1 time in total.
1963 VW BEETLE 1200
1985 BX 19GT Mk1
1991 BX 19TZI Auto A/C
1994 Xantia 1.8i SX
1972 Morris Marina 1.8 SDL
1979 Rover SD1 V8-S
1980 Morris Marina 1.7HL
2002 Rover 75 CDTi Connossieur SE AUTO Nav
2003 Rover 25 1.6i XL 5 DR

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Tim Leech
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Joined: Tue Apr 15, 2008 11:12 am
Location: Burton on Trent
My Cars: 1958 ROVER P4 90 UWP 84
1963 VW BEETLE 1200 KGJ413A
1972 Morris Marina 1.8 SDL BFA720L
1979 Rover SD1 3.5 V8-S TSL 982
1980 Morris Marina 1.7HL DBV468W
1985 CITROEN BX 19GT C1TBX
1991 CITROEN BX 19TZI AUTO A/C BXi 19
1994 CITROEN XANTIA 1.8 SXi M908HRY
2003 Rover 25 1.6i XL L33CHT
x 72

Re: BX 19GT PROBLEMS

Post by Tim Leech » Wed Apr 06, 2016 5:32 pm

Yes, but today it reved up ok and ran for a while and was well up to temp and would respond to throttle input, then just died, and refused to restart, until it cooled, it restarted briefly but was popping and misfiring and then stopped again.
1963 VW BEETLE 1200
1985 BX 19GT Mk1
1991 BX 19TZI Auto A/C
1994 Xantia 1.8i SX
1972 Morris Marina 1.8 SDL
1979 Rover SD1 V8-S
1980 Morris Marina 1.7HL
2002 Rover 75 CDTi Connossieur SE AUTO Nav
2003 Rover 25 1.6i XL 5 DR

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Kitch
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Re: BX 19GT PROBLEMS

Post by Kitch » Wed Apr 06, 2016 7:56 pm

Doesn't make sense that it's anything ignition-related then, other than the amp. Are you certain the carb is ok? Who rebuilt it?

Got your text by the way, I do have a spare dizzy from a 1600. No idea how well it works, but assume they're the same as the 1900?

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Tim Leech
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My Cars: 1958 ROVER P4 90 UWP 84
1963 VW BEETLE 1200 KGJ413A
1972 Morris Marina 1.8 SDL BFA720L
1979 Rover SD1 3.5 V8-S TSL 982
1980 Morris Marina 1.7HL DBV468W
1985 CITROEN BX 19GT C1TBX
1991 CITROEN BX 19TZI AUTO A/C BXi 19
1994 CITROEN XANTIA 1.8 SXi M908HRY
2003 Rover 25 1.6i XL L33CHT
x 72

Re: BX 19GT PROBLEMS

Post by Tim Leech » Wed Apr 06, 2016 8:35 pm

The guy who rebuilt it a an ex Peugeot mechanic and the head of a local technical college and is rebuilding a CX.

He said asides a bit of dirt the carb was in good order.

Mines running a ducellier dizzy.
1963 VW BEETLE 1200
1985 BX 19GT Mk1
1991 BX 19TZI Auto A/C
1994 Xantia 1.8i SX
1972 Morris Marina 1.8 SDL
1979 Rover SD1 V8-S
1980 Morris Marina 1.7HL
2002 Rover 75 CDTi Connossieur SE AUTO Nav
2003 Rover 25 1.6i XL 5 DR

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Kitch
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Re: BX 19GT PROBLEMS

Post by Kitch » Wed Apr 06, 2016 8:47 pm

Did he strip the auto-choke unit? Or just the carb itself?

The dizzy just wouldn't behave like this if it failed. It would either work all the time, or play up all the time. It wouldn't be more likely to work when the autochoke is closed as it has no way of knowing what the carb is doing.

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Tim Leech
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Joined: Tue Apr 15, 2008 11:12 am
Location: Burton on Trent
My Cars: 1958 ROVER P4 90 UWP 84
1963 VW BEETLE 1200 KGJ413A
1972 Morris Marina 1.8 SDL BFA720L
1979 Rover SD1 3.5 V8-S TSL 982
1980 Morris Marina 1.7HL DBV468W
1985 CITROEN BX 19GT C1TBX
1991 CITROEN BX 19TZI AUTO A/C BXi 19
1994 CITROEN XANTIA 1.8 SXi M908HRY
2003 Rover 25 1.6i XL L33CHT
x 72

Re: BX 19GT PROBLEMS

Post by Tim Leech » Wed Apr 06, 2016 8:52 pm

The auto choke had been off for a while when it died?

The plugs are wet and you can smell petrol though.
1963 VW BEETLE 1200
1985 BX 19GT Mk1
1991 BX 19TZI Auto A/C
1994 Xantia 1.8i SX
1972 Morris Marina 1.8 SDL
1979 Rover SD1 V8-S
1980 Morris Marina 1.7HL
2002 Rover 75 CDTi Connossieur SE AUTO Nav
2003 Rover 25 1.6i XL 5 DR

User avatar
Tim Leech
Over 2k
Posts: 15212
Joined: Tue Apr 15, 2008 11:12 am
Location: Burton on Trent
My Cars: 1958 ROVER P4 90 UWP 84
1963 VW BEETLE 1200 KGJ413A
1972 Morris Marina 1.8 SDL BFA720L
1979 Rover SD1 3.5 V8-S TSL 982
1980 Morris Marina 1.7HL DBV468W
1985 CITROEN BX 19GT C1TBX
1991 CITROEN BX 19TZI AUTO A/C BXi 19
1994 CITROEN XANTIA 1.8 SXi M908HRY
2003 Rover 25 1.6i XL L33CHT
x 72

Re: BX 19GT PROBLEMS

Post by Tim Leech » Wed Apr 06, 2016 8:54 pm

Image

Weak spark then a strong spark?
1963 VW BEETLE 1200
1985 BX 19GT Mk1
1991 BX 19TZI Auto A/C
1994 Xantia 1.8i SX
1972 Morris Marina 1.8 SDL
1979 Rover SD1 V8-S
1980 Morris Marina 1.7HL
2002 Rover 75 CDTi Connossieur SE AUTO Nav
2003 Rover 25 1.6i XL 5 DR

mds141
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Re: BX 19GT PROBLEMS

Post by mds141 » Wed Apr 06, 2016 10:25 pm

Fuel vaporisation?
Mark Smith

Is it just me or is everything shit?

1989 BX GTi 16 valve. Blanc Alpine. Completed the Citroen Classic Challenge Ecosse and 1337 miles without a hitch.
2000 XM VSX 2.1 td Auto. Rouge Magenta.
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Kitch
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Re: BX 19GT PROBLEMS

Post by Kitch » Wed Apr 06, 2016 10:27 pm

Video doesn't work

Richb
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Re: BX 19GT PROBLEMS

Post by Richb » Thu Apr 07, 2016 9:04 am

Weak and strong spark sounds like electrical. Im not that familiar with the petrol bx. But how does it pick up when to spark? Im guessing camshaft driven dizzy? Check the amplifier and all wiring. Have a double check of any wires that are none replacable as part of the ignition circuit. Incorrect coils do this kind of thing on the triumphs i work on.
2001 Peugeot 206 2.0 Hdi
1999 Peugeot Expert Van
1993 Citroen BX 1.9TXD
1992 Citroen BX 1.9TXD
1980 Triumph TR8
1972 Triumph Stag
1967 Triumph GT6

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Kitch
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Re: BX 19GT PROBLEMS

Post by Kitch » Thu Apr 07, 2016 9:57 am

Don't bother taking the plugs out to test them, get some plug testers or a timing gun, and test them while they're fitted. It's much harder for a plug to spark under compression than it is in the atmosphere, so you might find it's barely sparking at all. Dizzy doesn't generate the spark, it just distributes it, but then you've changed the things that generate the spark already, so it may be a wiring issue.

What still makes no sense at all, is why it'll run on cold-start fine, but only stop running once the choke opens again, and as soon as you touch the throttle pedal. Unless something's getting lost in translation here, or not getting conveyed over 'tinternet very well, I can't see how it's electrical.

Vid doesn't work for me, so can't give an opinion on the spark, but like I say, I'd test them fitted rather than in the open, as that's not the most accurate method in the world!

Tinkley
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Re: BX 19GT PROBLEMS

Post by Tinkley » Sat Apr 09, 2016 10:42 pm

Actually the dizzy does 'know' what the carb is doing a bit, from the vacuum advance/retard pipe. However it may be that the initial spark from the dizzy itself is too low causing too low a voltage at the coil and ultimately plugs. It happens on outboards and motorcycles where the stator (primary ignition winding coils) breaks down with marginal heat.....
Worth checking your battery voltage is good and alternator output high enough.

I'm afraid I don't trust HT leads to last much more than 12-15k although they can be good for 50k. My old 1.4 taught me that, new leads every plug change or they would break down a few k later. First thing was slightly worse fuel consumption, then the odd miss, then rough running and bad starting. Caps I change religiously every 25-35k max along with arms. They just get too pitted for accurate sparking and fuel economy. I've not had a cracked one yet on a BX, but some pretty badly pitted contacts and corossion, including in the lead end socket.
Copper leads and NGK caps last longer by a mile than the carbon filled common leads btw.

As it happens I am in process of sorting a 2001 Mariner 25Hp with similar problems and the main suspects are stator and float needle and valve. Either can give similar symptoms. Been through pretty much all the rest, coil packs, replaced waxstat, stripped and cleaned carb (Keihan) including the 0.2mm or 0.15 holes in it... etc etc.