Friends 96 LT1. He has had the water pump and opti changed recently. Since then it has a miss after it warms up and smokes(black smoke) from the left bank. Since this started he has changed the Mass Air Sensor, plugs ,and wires. The only code it shows is Bank 1, Sensor 1. Today I changed the O2 Sensor for him and it still has the miss after it warms up. Any thoughts as what I should look for ?? Also when he changed the plugs the left bank plugs were shot but the right bank plugs looked like new.

hm... I will have to check the book.

Can you give me the exact code?

No I cant Andy. They used a scanner at auto zone and I only read the bank 1 , sensor 1 on the display. I didnt catch the actual code itself.

A leakdown test on the injectors and a compression test would be a good start.

Did a compression test on the left bank and all were 140 or better. Injector testing was my next step. Any good write-ups on injector testing ?

Quote:

I second that and would add that one or more might be partially clogged. You might be able to determine that with a scan tool, looking at the LT and ST corrections.

a simple leak down test on the injectors is to put on a fuel pressure gauge and charge the system... see how long it takes for the fuel pressure to bleed off.

It could also identify a wacky fuel pump.

Another test is to remove the injector rails, charge the system and see if any injectors continue to leak. You can put little paper cups under the injectors and watch to see which ones leak or dribble some.

You may want to check out Mekanics thread, too. He has a good source for injectors at a great price.

Pulled the fuel rail last night and #7 was stuck wide open and flooding the cyclinder. Looks like he'll be buying a new set. I will have him get in touch with Mekanic. Thanks gurus!

that answered that!

The GM/Multec injectors are ok, but not very durable.

I'm a witness .....

ME TOO

Dang, that Bogus is good ;-)