spark plugs

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rutter123
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spark plugs

Post by rutter123 » Sat May 17, 2014 9:04 pm

these are the plugs from the gti, as they came out from l-r, 1 and 3 lean? your thoughts.
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Leobx16v
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Re: spark plugs

Post by Leobx16v » Sat May 17, 2014 9:11 pm

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

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G650PGX 1989 ph.2 red BX 16v
G-VOT 1989 ph.1 White BX 16v

rutter123
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Re: spark plugs

Post by rutter123 » Sun May 18, 2014 9:42 am

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
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Re: spark plugs

Post by bx petrol auto saloon » Sun May 18, 2014 6:27 pm

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
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Way2go
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Re: spark plugs

Post by Way2go » Mon May 19, 2014 1:02 am

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
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Re: spark plugs

Post by rutter123 » Mon May 19, 2014 7:04 pm

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
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Re: spark plugs

Post by Tinkley » Wed May 21, 2014 10:17 am

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...