Hey guys, I have no combustion on pass side car runs like crap, no power noticible miss ect If I put my laser thermometer on exhaust ports 2-4-6-8 they're cold 80-90 degrees. 1-3-5-7 are 500 plus degrees Fuses are good, new walboro 255 pump, new injectors, new distributor, fresh tune up Any insight? Idk what to check next could it be a grounding issue? I did search a lot of threads for hours and I can't find an answer.

Thanks, John

 

You said inj fuses are good but did you check voltage to that bank inj? Put a noid light on the inj wiring to make sure it is pulsing

On a 91 it is a pnk/bulk from c207 g that is the hot wire and gnd is being switched from dk grn wire going to the ECM c2 c12 on my schematic

 

It is pulsing, I did a noid test earlier today.

 

HIGHLY unlikely with the two cross overs in the rail but, clogged fuel rail? Just about everything that could go wrong would affect both sides except the injector pulse and you checked that. Maybe check for a leak at the manifold gaskets for that side?

 

I'll test vaccume and for intake leaks today and report back.

 

How about have you pulled a plug and confirmed it is wet. Ie are you getting fuel in the cylinder.

Also then how about spark. Do plugs on that side give you a spark with a tester touching that head. Does the head somehow not have a good ground

Fuel, air, spark to at least get to the point that side fires

 

I found the problem guys. I don't know how but the fuel rail and injectors were clogged on 2-4-6-8

 

How well does the injector cleaning fluid that you add to the fuel tank work on TPI cars?

 

 

Not well enough to clean these! ⬆️

 

Wait....I was right with the clogged rail? Do I win a prize? Kidding. I don't know how many people have definitive proof of additives making a difference. Not saying none of them do but real first-hand accounts are probably rare. I've used Lucas injector cleaner and notice a mpg improvement on my LT1 but that doesn't prove anything.

 

I've worked on A lot of tpi's and I've never seen anything like this crap lol

 

What would have caused that muck?

 

How long has this car been sitting? Fuel filter ever been changed?

 

Ethanal... Not sure

 

Only has 32k original miles it sat most of it's life in a garage. I just went through the entire fuel system new walboro 255 pump flushed tank, lines and fuel rails and another new set of injectors the car runs perfect now.

 

Race gas additive can leave that type of deposit.

Make sure you change the fuel filter and maybe check inside the tank.