spark plugs

BX Tech talk
Post Reply
rutter123
Over 2k
Posts: 2695
Joined: Sun Sep 02, 2012 9:54 pm
Location: South Lincs
My Cars: 90 Bx Tzd turbo ven red 295k
74 D Super 5 black
05 Volvo V50 2.0d 180k
65 Peugeot Boxer work van 280k
x 136

spark plugs

Post by rutter123 »

these are the plugs from the gti, as they came out from l-r, 1 and 3 lean? your thoughts.
Attachments
003.jpg
90 BX Tzd turbo 294k SORN undergoing major surgery
90 BX Tzd turbo estate 46k awaiting surgery
65 Peugeot Boxer Van the new workhorse
52 Toyota Rav4 180k Bulletproof Jap reliability
User avatar
Leobx16v
BXpert
Posts: 192
Joined: Mon Jan 17, 2011 8:41 pm
Location: Blackpool
x 1

Re: spark plugs

Post by Leobx16v »

They look fairly new and a good colour but the pic isn't the best quality.
1991 Citroen BX 16v - Red
1991 Citroen BX 16v - Silver
1992 Citroen BX 16v - White
1989 Peugeot 205 MI16 - Miami Blue
2002 Peugeot 406 est. HDI110 exec - Dark Blue
2006 Citroen C6 2.7HDi Exclusive - Storm Grey

Scrapped:
G650PGX 1989 ph.2 red BX 16v
G-VOT 1989 ph.1 White BX 16v
rutter123
Over 2k
Posts: 2695
Joined: Sun Sep 02, 2012 9:54 pm
Location: South Lincs
My Cars: 90 Bx Tzd turbo ven red 295k
74 D Super 5 black
05 Volvo V50 2.0d 180k
65 Peugeot Boxer work van 280k
x 136

Re: spark plugs

Post by rutter123 »

New plugs only been run for 1000 miles, new cap/arm, coil, leads (boughicord) temp sensor, fuel pump/filter and lines, injectors cleaned, no air leaks, still lean on 1&3 even after richening the mixture back up a few turns post MOT, still a little hesitation in lower rev range. The SAD is working and closes fully once warm, compression is good @ 175. 174, 175. 177, timing is set and vac/ad is working, but still this prob persists, tho not as bad as it was, does anyone know the standard approx factory setting for the air/mixture screw on the airflow meter? Mine is currently set @ 7.5 turns out, running about 4.5 on the co's, maybe needs a little richer? But then the idle is unsettled.
90 BX Tzd turbo 294k SORN undergoing major surgery
90 BX Tzd turbo estate 46k awaiting surgery
65 Peugeot Boxer Van the new workhorse
52 Toyota Rav4 180k Bulletproof Jap reliability
bx petrol auto saloon
BXpert
Posts: 477
Joined: Mon Aug 22, 2011 11:50 am
Location: Tonbridge KENT
My Cars: Citroens SAABs and Vauxhalls
x 2

Re: spark plugs

Post by bx petrol auto saloon »

Why is it that your car seems to be running so rich :idea: My SAAB is of the same era and with no cat and is also multipoint fuel injection. The c/o rates for cars with carbs is upto 3%, the c/o rates for injection cars should be 1.5% My SAAB runs at 1.75% on the M.O.T's and has done so for years now without any adjustments at all :D :wink:
Secondly, please forgive my own ignorance :oops:, when you say you car is running lean, does that mean too weak or too rich :?:
I hope this helps :)
Vince.
Passion Hydropneumatic Citroen,s

Cars;- 1993 White Citroen BX 1.6 TXi petrol
saloon auto with air-con & ABS.
47,594 Miles from new.
Owned for 3 years sorned.
1988 Silver SAAB 900i 2.0 8v F/lift,
saloon 5sp with 3 spoke Ronals,
69,000 Miles from new.
Owned for 15 years T & T.
User avatar
Way2go
Over 2k
Posts: 7279
Joined: Fri Jan 13, 2006 3:15 pm
Location: RCoBerkshire
x 2

Re: spark plugs

Post by Way2go »

rutter123 wrote:these are the plugs from the gti, as they came out from l-r, 1 and 3 lean? your thoughts.
I presume that your GTi is earlier Jetronic rather than Motronic as you mention new cap/arm & coil?

I wonder if you have a sluggish ignition amplifier that is giving a deformed pulse every second output causing a slower burn as a result? :?

It also could be dirty injectors causing faulty fuel metering. Try swapping injectors 1 & 2 on the rail and see if the lean/rich effect transfers.
1991 BX19GTi Auto
rutter123
Over 2k
Posts: 2695
Joined: Sun Sep 02, 2012 9:54 pm
Location: South Lincs
My Cars: 90 Bx Tzd turbo ven red 295k
74 D Super 5 black
05 Volvo V50 2.0d 180k
65 Peugeot Boxer work van 280k
x 136

Re: spark plugs

Post by rutter123 »

Way2go wrote:
rutter123 wrote:these are the plugs from the gti, as they came out from l-r, 1 and 3 lean? your thoughts.
I presume that your GTi is earlier Jetronic rather than Motronic as you mention new cap/arm & coil?

I wonder if you have a sluggish ignition amplifier that is giving a deformed pulse every second output causing a slower burn as a result? :?
It also could be dirty injectors causing faulty fuel metering. Try swapping injectors 1 & 2 on the rail and see if the lean/rich effect transfers.
Have had the injectors cleaned, yes is jetronic LE3, thats a good shout with the injectors, will swap 1/2 and 3/4 round, but if there is still running lean then there is a significant prob somewhere, then it gets down the electronics side of things which is way out of my league, ecu hell.
90 BX Tzd turbo 294k SORN undergoing major surgery
90 BX Tzd turbo estate 46k awaiting surgery
65 Peugeot Boxer Van the new workhorse
52 Toyota Rav4 180k Bulletproof Jap reliability
Tinkley
1K Away
Posts: 1502
Joined: Sat Jun 06, 2009 11:27 am
Location: N Hants England
x 8

Re: spark plugs

Post by Tinkley »

Hold on my non fuel injection 1.6 runs at 0.15% CO.... according to the MOT station and I have even had lower scores...
Post Reply