Quote:
Originally Posted by Franke
An update to this problem. After some testing of the PCV system, vaccumn, Fuel pressure and fuel injectors i found the following: The bottom PCV hose had 5 splits in it. The vaccumn reads good everywhere i could test and is 14.5 at idle steady. The multec fuel injectors have some problems. Of the 8 primaries cylinder #5 reads 10 ohms cold and 6.5 ohms hot. All the others are approx about 13 ohms hot and cold. On the secondary side i read cylinder # 3 at 10.6 ohms cold and 7.6 ohms hot. Cylinder # 4 is way off at 1.5k ohms cold and 1.7k ohms hot.
Looks like its time to replace the injectors. This could be why i am running a bit lean i think on the primaries.
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Hi Frank & welcome to the asylum! Yea, those numbers on the injectors are not good. It's time. Also, the vac leaks like Mike said are very important as on a 90 they are a bunch of small ones that add up to cause an even leaner condition. I have to agree on the O2 sensors. I did mine at 17 yrs and got an immediate improvement in NOx, but I had already done the vac leaks & injectors and I was still very close on the NOx till I did the O2's.
You want maybe to look at Jerry's or Limey's PCV replacement parts for the hoses, and soak the valves in carb cleaner to make sure they are free. Check the double connector just under the TPS as that one is most likely very loose, I put a zip tie around mine & a dab of silicone to help seal the old tired rubber.
I'm so glad NY state did away with the roller test in my area! That was always a PIA for the car. Oh, not to be a wise guy, but turn the key OFF. I used to forget to do that!
Tom