I did the plenum today because I knew I had a vac leak. I'm idling at about 1200. I put everything back together, and I still have a vac leak. I was trying to find it, and, after spraying starter fluid all around the intake manifold, I was able to isolate the leak to the injectors. I put a new o-ring on each injector before I put the rails back on, but the leak is decidedly from the injectors. How do I fix this?

sgg93

 

did you clean out the holes the injectors go into? They tend to collect a fair amount of crap......

Are the injectors seated all the way into the hole?

 

I didn't clean the holes out, but I think they're seated. Somebody said that you were supposed to use 2 o rings per injector. I'm not sure how that would work. The weird thing is that they're all leaking.

 

two per injector, one on top, where it goes into the fuel rail, one on the bottom, where it seats into the manifold.

Pull the fuel rail, hit the injector O-rings with a bit of K-Y jelly, or something similar (NOT Vaseline, that is petroleum based, and will dry out the o-rings.....) and stick 'em back in. See if that helps.

 

Well, right after I got everything back together, I was idling in my driveway and noticed the symptoms in the above post. We were going to take it to dinner, and I made it almost a mile before my temps went to over 260. I had just put in a new T-stat, so I wasn't sure what was going on. And I had the vac leak from hell. Well, I boiled out about 2 gallons of of coolant between where I turned around and the house, so I parked it and we took the car to go eat. When I got back, my temps were right at 130, radiator was about 1/2 full, and the overflow reservoir was empty. So I put in about 3 quarts of antifreeze and about a gallon of water, and started it up. No vac leak! My temps hovered about 180 for the next ten miles of driving and 20 mins of idling. I called one of my buddies to discuss it and best we can figure, I had an air bubble in one of my coolant lines that let part of the head get insanely hot, and the coolant flashed to steam when it hit it. And as for the injectors, we think that they just settled in after being run a little bit. It runs as well as it ever did, probably even better. Now for that pesky exhaust leak...

sgg93