New Injectors and now it runs like.......

Not much help .... but here goes

You are beginning to learn the fun of owning old cars. They can become absolute nightmares, in a fun way, IF you keep your head on straight.


You may have gotten a "faulty) new injector. It does happen. Look for a glowing exhaust manifold port to see if it is running poorly on a cylinder or two. Gas still good or has it been sitting for 2 or more months?



As an Aside:

My car has more issues than the Sunday Times. And I wanted that. I wanted to bring something of worth that had been neglicted back to life, ONCE in my life. That was a "Must DO' for me. Yep. I am a stupid idiot and I am loving it.


Everytime I fix one thing another three pop-up that I did not notice before. Some faults will seem to hide or cancel out others. I call it "F&F" (it's Fixed and I'm F-ked)


So far I am into: new injectors, wires, extenders, caps, lines, plugs, (new used) ECUs, cleaned grounds, etc, etc., and have fixed one fault only to have three more pop-up to find why number 2 exhaust port is SO HOT. It is now a warm glow instead of Dantes Inferno so I am getting there. Only taken 1.5 years to get here but I work VERY, VERY SLOW and my working life has been beyond hectic for the past 6 years.


When I got all that done (Number 3 glow Fixed), you should have seen the lightening show in the engine bay. Subtle but beautiful. Now WTF?!?!?!?!

Fixed that last night. New coils and cleaned up the mount and ground. Lightening show gone. On to the next possible fix.



The way I am chasing old & NEW "Ah-$hits" I will be an uncertified but qualified Ferrari Tech.



Fun, faith and patience and a bit of cash and you'll get it sorted. Take your time, go slow, get it right AND HAVE FUN DOING IT.



Seriously, if you are NOT HAVING FUN, bail now! Can't stress this enough.

 

After replacing really old injectors, you really do need to have the base mixture reset with a gas analyzer.
The fuel distributor sets the base mixture, and compensation for old, clogged injectors will likely make new ones run rich.

Base mix also has to be done with the lambda loop disabled, on CIS Lambda cars ... which, I believe, includes the QV.

I've been looking at the new injectors, too. But I know that has to be done along with a tune up to replace old plugs and reset the mix.

 

this old car rap sounds very familiar.

i was helping my mechanic friend re-install the head on an old d-type jag.

we got everything buttoned up so i said i'll be back in the morning to finish.

we got all the ancillaries mounted and were ready for a restart.




the radiator started leaking.......
don't all brit cars come back to life this way?

 

Yep...exactly correct.
Despite the "just throw them in there and all will be OK" posts, your experience is often the unfortunate outcome...

 

Now those are words of wisdom!

 

i took a picture once of the only living creature in lower waterford,vt.
after i returned my book to the free and unsupervised library, there he was....

the town dog.

he was the zen of this buccolic village.

what does this have to do with fuel injectors?

probably nothing unless you know the neighborhood.

 

By "Doing it myself" are you talking about getting a 5 gas analysis done and using the data to trouble shoot?

There is some good info here about what the different gas values can mean
http://www.autoshop101.com/forms/h56.pdf

I learned a little by reading the above

I am guessing that you dont have a smog requirement like in California. There is a smog inspection station on every corner there. How about a small airport nearby? Could there be an analyzer there? Are they used to trouble shoot aircraft engines?

 

be aware the ethanol in the fuel is now really fouling alot of different cars fuel systems. i would run some Seafoam cleaner, change the fuel filter a few times over the next few months or so, and for sure get the mixtures calibrated before driving the car much more !

 

Any repair shop, smog or not should have a 4 or 5 gas analyzer. If they do not, run. Tuning ANY fuel injected car requires one and any mechanic with half a brain knows how indespensable they are for diagnosis. There is only one word to describe someone without one.....Stupid.

 

After reading the link I would agree with you 100%

 

"There is only one word to describe someone without one.....Stupid."

C'mon Brian, quit beating around the bush and say what you mean!

 

Ok, here's a low tech way to get this done. It works fine, but you'll need some patience and a bit of time. It's not fast. What you're trying to do is to set the correct F/A ratio without a costly gas analyzer. In it's place you can use a visual method to determine the optimum F/A ratio.

Order one of these: http://shop.ebay.com/items/colortune?_dmd=1&_sop=12&rvr_id=&rawquery=colortune&OVRAW=colortune&OVADID=21132197512&keyword=colortune&OVKWID=199305963012&MT_ID=499&crlp=21132197512_1&OVMTC=standard&tt_encode=raw&OVADGRPID=8165266900&OVKEY=colortune&OVNDID=ND1&OVCAMPGID=4401017512

It is an insert that goes in place of the spark plug that you can use to see the actual combustion event.

You will need a long 3mm allen to do the adjustment to the CIS fuel head. The adjustment screw is a detent in between the distributor housing where all the fuel rails leave and go to the injectors, and the air inlet metering plate. Warm the car fully, then remove one of the spark plugs from an inside cylinder. insert the Color Tune into the plug location, and connect the long wire extension. You may or may not need the outer tube on it, I never have.

Now start the car, and let it idle. Look down the well of the plug hole where the colortune is and you will see the color of the combustion event in the glassine surround of the tool. It will likely be very light blue, or maybe white color. Now, get your 3mm allen wrench into the adjustment hole and see that it is seated into the adjustment screw snugly. As viewed from the top, turning it Right = Rich, and Left = Lean, or CW = rich, CCW = lean. Hold the RPM at 1500 and turn the allen gently to the right while watching the colortune glassine surround. It should get more blue if the engine is too lean. If the engine stumbles badly it was already to rich and you will need to turn the screw to the left.

Adjust the F/A by turning the 3mm allen as needed to keep the color of the combustion event nice and blue. Then you can turn it just slightly back to the left(lean) and go for a short drive. If you smell unburnt gas, you're too rich, and will need to lean it out.

Try not to run the car too rich too long, it can foul plugs and of course overheat the cats. Make small adjustments to the mixture screw as it's pretty sensitive.