Dead cylinders 1-3

[Bernacchi]

Thank you all
the problem is solved

i have compared the energy in cylinders 1-3 with that in 2-4 and they are the same.
so i tested the demand of energy in the 4 fuel injectors and discovered a 3x higer demand in the fuel injector #3

once i had a spare injector , it was only the work of replace it

the car is OK now

good new year for all

Regards
Marcelo

[Enright]

Thanks for posting your solution - I've not heard of that problem happening before so it may be useful in future.
What do you mean when you say you "have compared the energy in cylinders" - how did you do that?
And did you test the demand of the injectors with a multimeter?

[Bernacchi]

Hi,

i asked the help of a friend , he has a oscilloscope.

what i tried to say is that the first step was compare the energy in the wires that energizes the fuel injectors 1-3 with the energy in the wires of the fuel injectors 2-4 (in volts)

after this, we mesure of demand of energy in each fuel injector (watts), where we find the problem in the injector 3 (demanding 3 times more than the others)

thanks again
Happy new year

Regards
Marcelo

[clemo]

good news.

[Specky]

Glad to hear you got it sorted...

Here's a question thou...

You had your symptom... your investigation found the defective component, but do you know what was the fault with the component...

e.g. A blocked filter on the injector


TTFN

[JonM100]

I had similar problem, 2 cyl down, was in auto parts business and replaced some electrical components (coils, wires etc), because I could get cheap. Was not the answer, and had we done careful testing would not have had car laid up for so long. It turned out 1 injector was bad, (check impedance on yours, if one way different than the others it has failed, I think I got reading of 2.4 ohms, others were .8ohms), that injector in turn caused the injector circuit in the ECU to fail (overheat), and now you have 2 injectors not operating, as the circuit governs operation of 2. Fitted modified Bosch injectors and rebuilt Isuzu ECU and car runs great. Injector supplier says The oem injectors in our cars (GM, Siemens, whatever) are junk, same as fitted in Esprits same vintage. Contact me off list for my suppliers if interested, they are in US. Cost $320/4 injectors, $295 I think/ ECU

[DeanG]

I had a similar problem. It was intermittant (over a period of about 2 years) which made it extreamly difficult to diagnose. Once the injector became consistantly bad the problem was found. A new set of injectors and a new ECU fixed the problem.