It's leaning out for some reason, maybe an air leak after the MAF, or maybe low fuel pressure. The air leak is more likely, so start taking a careful look at the whole induction system, from the duct leaving the air box, to the hose connection at the throttle body. Also, look at any hoses and check valves leading to the intake manifold. You may have to pressurize the intake path to find the leak, if there is one. This can be done by using common PVC pipe plugs of the appropriate sizes, from the hardware store. One plug needs a Schrader (tire inflater) valve to allow your tire pump to pressurize, but carefully so as not to exceed say 20 PSI.
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I was leaning towards the vacuum leak too. Sat I woke up at noon after working 12 hr shift to 4 am ( yay, 2nd shift). It was snowing and the garage was cold. Did a look around the engine bay, using mirrors and flashlight didn't see anything. Got cold, went inside grumpy and tired from the nite before.
Started looking around on vac leak detection, seeing smoke machines, etc. Didn't want to set anything up like that up, I wanted quick and easy. I was going to attempt to pressurize the system with about 10 psi of air, figured with the compressor running there would be no way to hear the air leak. I had a spray bottle that I was going to fill up with soapy water, it had spray or stream setting on it. Too late and too tired, I at least had a plan of attack for Sunday.
Sunday comes and the sun was shining, I got the compressor ready, filled up the spray bottle and off to the garage I went. I thought I would do another visual check of the vacuum and very gently wiggled the various connections, what did I see? Focus on the suction jet pump
Back to work now on removing that piece, fun with those once time clamps.
Done, problem solved. The L shaped pipe from the suction jet pump to the intake was very clean. For those of you servicing the PVC, normal?
Started looking around on vac leak detection, seeing smoke machines, etc. Didn't want to set anything up like that up, I wanted quick and easy. I was going to attempt to pressurize the system with about 10 psi of air, figured with the compressor running there would be no way to hear the air leak. I had a spray bottle that I was going to fill up with soapy water, it had spray or stream setting on it. Too late and too tired, I at least had a plan of attack for Sunday.
Sunday comes and the sun was shining, I got the compressor ready, filled up the spray bottle and off to the garage I went. I thought I would do another visual check of the vacuum and very gently wiggled the various connections, what did I see? Focus on the suction jet pump
Back to work now on removing that piece, fun with those once time clamps.
Done, problem solved. The L shaped pipe from the suction jet pump to the intake was very clean. For those of you servicing the PVC, normal?
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