Dads90

Sorry my bad, the only way is to replace all eight. You'll get tons of advice when it come time to start. Its a little time consuming but if you label bolts and take your time, it will go back together faster.

unkn0wndj

It doesn't sound too bad. I'll check them tomorrow and if so I'm going to order a set of the BIIIs.

carson

My guess is it might be the O2 sensor when it goes into closed loop operation. On my 90 I found the wire had worn thru by rubbing and was shorting out, replace O2 sensor and wire.

Replace the stock Multecs also, mine failed and ruined the cats.

unkn0wndj

I'll have to check it out.

UPDATE: I checked my injectors today and all are 17 but one is 14 and the other i cant get a steady reading until it says 3, but i doubt that's possible.

FICINJECTORS

that is very possible.. try to get a good reading, but a shorted on can read 2 or 3 very easily, if it is there is your problem

unkn0wndj

Yeah, should 1 be 14 while the others are 17 also? I'll probably order a set here shortly.

FICINJECTORS

the 14 is starting to go, is the other at 3 ohms for sure?

unkn0wndj

I can't tell. If i hold the multimeter on the terminals it goes through a lot of numbers and then reads 3.

FICINJECTORS

that is because its shorted, I think its time for injectors

unkn0wndj

Sounds like it. Which do you recommend I get from ya?

FICINJECTORS

here ya go, thank you
http://fuelinjectorconnection.com/sh...&productId=134
don't forget to order the gasket and fuel rail seal kit also

seajayiii

100 Percent!!!

aklim

Have you checked ignition wires, plugs and fuel pressure?

Wicksta25

Im having a similar problem whith my 90 as well so if you figure it out let me know thanks..

aklim

What have you checked?

RLG

I bought mine from Jon at FIC. He knows his business, and will help you with the install if you need it. He sends good installation instructions.

Plus his injectors don't come from salvage yards.

j-wireman

I have had to replace my injectors, too. One of them failed and stayed open. Fuel poured into the cylinder and overnight filled the block up to the spark plugs. Pull the fuse to the fuel pump. Yeah, I know, "Bet your engine is really clean inside, now". Probably, but I could have had a really bad fire, too. Besides, I don't know what to do with the 5 gallons of gas/oil mix I drained out!

I replaced mine with stock injectors. Haven't had any problems. But, I am going to replace the Catalytic Converter (with a high-flow model), as I'm afraid that some gas could have gotten inside and ruined it. Another reason to pull the fuel pump fuse.


Mike
'90 'vert

unkn0wndj

Thanks for the advice man.

I just put a fuel pressure gauge and when i turned the ignition key to the ON position it read 30 psi. Once i started the motor it was bouncing around 30 psi. I think that's a bit low. Where do I start?

unkn0wndj

Ignition wires + plugs are brand new.

aklim

Way too low. I'll bet that under load it will drop even more. There is only so much increased pulse width can compensate for that. Tape the gauge to the glass and do a WOT run. I'll bet it will drop a lot more than the 45 psi it should be at.

3 things you need. Air (unless you have a blockage somewhere, it should not be a problem. Spark (need a solid blue flame with no heat soak of the coil and other ignition components). Fuel (pressure and pulse width).

Can you have more than 1 problem? Sure. One way to see is to take a good spark plug and ground the threads. Disconnect a wire when it is running and connect it to this plug. Better yet, get a spark tester. You should see a strong blue flame at night.

Fuel. You need to have enough pressure. 45 psi is nice to have. Why is your's so low? Maybe there is an obstruction like a dirty filter, either in the tank sock or the actual fuel filter. Another problem is the fuel pump. Is it getting enough current? Is it weak?