Login | Register
SearchMy Stuff
My ProfileMy PreferencesMy Mates RSS Feed
2
Reply to Topic
Author Discussion

TMRnoV

Original Poster:

92 posts

21 months

[news] 
Tuesday 9th October 2012 quote quote all
Hi All, Car (S2 2.9) is only running on 5 cylinders, I have changed the dizzy cap, HT leads, rotor arm and plugs, no change still on 5 only, what should the next step be ? fuel injector ? and if so anyone got a part number or source ?

Cheers

Tim

GadgeS3C

3,440 posts

47 months

[news] 
Tuesday 9th October 2012 quote quote all
Obvious question - but are you getting a spark on all cylinders?

mep12345

1,953 posts

84 months

[news] 
Tuesday 9th October 2012 quote quote all
Tim, I have said before I have a lot of spares you can borrow for diagnosis. Drop me an email on mark@gbsportscar.com and ill send you my contact details. I assume you are close to Plymouth given your last post. The spares I hold includes a full set of injectors

I also have fault code reader that may help

Hth

Mark

Barkychoc

7,380 posts

87 months

[news] 
Tuesday 9th October 2012 quote quote all
Pretty sure they fire in 2 banks of 3 - ie 3 injectors fire at once so if you determine which you can swap a plug from a working cylinder to your duff one to see if it fires.

mep12345

1,953 posts

84 months

[news] 
Tuesday 9th October 2012 quote quote all
Barkychoc said:
Pretty sure they fire in 2 banks of 3 - ie 3 injectors fire at once so if you determine which you can swap a plug from a working cylinder to your duff one to see if it fires.
I might be wrong but as they fire into each chamber individually I'd be surprised if they fird together. By chamber I mean induction chamber not cylinder. If they fired together in banks then the fuel would have settling time on two cylinders before being drawn into cylinder. I think the bank firing may have been the 2.8 engine with the earlier fuel injection system and a very differrnt induction set up. I await to be corrected as I am working on my assumptions from current engi e rebuild where the induction system has just been reassembled.
Advertisement

Stew Mc

301 posts

56 months

[news] 
Tuesday 9th October 2012 quote quote all
GadgeS3C said:
Obvious question - but are you getting a spark on all cylinders?
Would second this.
IMHO start with the basics. Find out which cylinder is down using insulated pliers, engine idling and pull off and refit one plug lead at a time. Presume you don't have a catalyst? If so probably not recommended but if it is down on a cylinder, any damage to the cat has more than likely been done.

The offending cylinder will show itself as the idle will not change when the lead is removed.
Once you find the offending cylinder have you got a spark and fuel to it? If spark and fuel are OK, I would move on to a compression check. Not aware of these engines burning valves but they are old now and a tight tappet could have caused a problem.
If you are not happy doing the above, find someone who is local and can help. I would not jump in too deep until spark, fuel and compression's are known.
Cheers, Stew.

TMRnoV

Original Poster:

92 posts

21 months

[news] 
Tuesday 9th October 2012 quote quote all
Hi and thanks for the suggestions, and thanks Mark I will drop you an e-mail, actually hoped I'd you see last night at the Corn Mill but understand from the other guys that your not around during the week.

Anyway it's cylinder number 4 that's not firing, after fitting new leads, plugs, cap and rotor arm surely it can only be that cylinders injector that's faulty, I'd be very unlucky to buy a faulty cap, unless of course it's the distributor ?

Other than that the only the other thing is low compression, feel the need to buy a tester coming on.

Tim

phillpot

7,617 posts

66 months

[news] 
Tuesday 9th October 2012 quote quote all
mep12345 said:
I might be wrong
Think you are laugh






So, definately No. 4 ?

Have you pulled plug lead off and briefly run engine with a spare (one of the old) spark plug plugged in and resting on the engine ? does it spark?
Alternatively push a screwdriver into the lead and hold near (1-2mm) to a good earth (the plenum) should be a good blue spark ?

If you now take plug out it should be wet, bone dry would suggest no petrol reaching that cylinder

Injectors are obviously electrically operated, is the connection good ? if cable long enough swap plug with cyl. five, does misfire move to 5 or stay on 4?

this is what I would do, others may have different ideas scratchchin good luck!


mep12345

1,953 posts

84 months

[news] 
Tuesday 9th October 2012 quote quote all
phillpot said:
mep12345 said:
I might be wrong
Think you are laugh
Mmmm must be that the timing of injection isn't that sensitive to timing and can deal with small "settling" time in induction chamber. As I said working from assumptions with no books here as away from home.


Tim, also have in line spark testers you can borrow to prove spark as Mike above mentions

phillpot

7,617 posts

66 months

[news] 
Tuesday 9th October 2012 quote quote all
mep12345 said:
Tim, also have in line spark testers you can borrow to prove spark as Mike above mentions
Or just grab hold of the lead, if you go "ow ow ow ow " you've got a spark smile

mep12345

1,953 posts

84 months

[news] 
Wednesday 10th October 2012 quote quote all
phillpot said:
Or just grab hold of the lead, if you go "ow ow ow ow " you've got a spark smile
roflrofl

TMRnoV

Original Poster:

92 posts

21 months

[news] 
Wednesday 10th October 2012 quote quote all
OK thanks chaps, I have checked the spark at number 4 and that is good (used old plug and marigolds) the plug in number 4 is dry so no fuel, can we say categorically that it's an injector at fault?

Tim

phillpot

7,617 posts

66 months

[news] 
Wednesday 10th October 2012 quote quote all
phillpot said:
Injectors are electrically operated, is the connection good ? if cable long enough swap injector plug with cyl. five, does misfire move to 5 or stay on 4?

jwoffshore

337 posts

137 months

[news] 
Wednesday 10th October 2012 quote quote all
It could be a faulty injector, or it could be a break in the wire or poor/dirty connector. Have you checked you are getting 12V pulses from the plug to that injector? Simplest would be an old style voltmeter with a needle. You'll see the meter jump a little, but it won't ever read 12V because the pulse is too brief.

Simon says

11,108 posts

104 months

[news] 
Wednesday 10th October 2012 quote quote all
Very easy to diagnosis a faulty injector while the motor is running (idling) run a long screwdriver from the inj body to your ear (crude stethoscope) and you will hear it clicking away (no you don't need a trained ear) if the car as spent any amount of time with the fuel rail dry/laid up then sticking can happen and frequently does on older injectors with a bit of gum/varnish around the pintel area frown I have fitted s/hand engines that have spent long periods with dry fuel rails/injectors and had maybe 1 or 2 inj's stuck closed (no clicking) sometimes freed with a couple of taps with a small spanner on the steel body while the engine is running to bring them back to life again scratchchin although if they have got this bad I would strongly recommend getting them all ultrasonically serviced anyway thumbup the Ford 2.9 Cologne is batch/bank fired injection not sequential as suggested earlier smile good point by Philpot about swapping inj plugs over to diagnosis duff cylinder/fault yes





Edited by Simon says on Wednesday 10th October 22:00

phillpot

7,617 posts

66 months

[news] 
Thursday 11th October 2012 quote quote all
Simon says said:
I would strongly recommend getting them all ultrasonically serviced anyway thumbup
I had a set serviced by www.injectortune.co.uk , didn't have a problem but was doing fair bit of work on engine so was a case of "while they're out" wink

Simon says

11,108 posts

104 months

[news] 
Thursday 11th October 2012 quote quote all
phillpot said:
Simon says said:
I would strongly recommend getting them all ultrasonically serviced anyway thumbup
I had a set serviced by www.injectortune.co.uk , didn't have a problem but was doing fair bit of work on engine so was a case of "while they're out" wink
Very wise smile the flow chart before and after always makes interesting viewing too eek

mep12345

1,953 posts

84 months

[news] 
Thursday 11th October 2012 quote quote all
Tim if you want them serviced there is a place in cattedown that does the job. £15 to test and another £10 if service needed. Per injector. Not sure how that is for price but had them quote for me recently and the guy advised me not to bother given my symptoms so turned down work he could have easily had-normally a good sign. They do the lot in a day too. Can't remember name but have details at home, they are in the old Lucas building

TMRnoV

Original Poster:

92 posts

21 months

[news] 
Thursday 11th October 2012 quote quote all
Thanks for all of the advice/help guys but I have sourced some new injectors (6) and they should be delivered tomorrow, taking the plenum and throttle body to be soda blasted as well (I know it doesn't contribute to the poor running but they will look nicer cool )

Probably get the old injectors serviced as well, always good to have spares.

Tim

phillpot

7,617 posts

66 months

[news] 
Thursday 11th October 2012 quote quote all





hehe...hehe...hehe
2
Reply to Topic