The intake connectors between the MAF and the DK's on my car are very hard. I was expecting them to be pliable to some extent. Is this the effect of age and heat or are they supposed to be hard plastic? They are surprisingly inexpensive to replace (~ $8 ea).
850iintake.jpg
Any words of wisdom with regards to the Engine wiring harness; As you can see in the pic below, mine touches the valve cover and the outer jacket is broken. I can tape it up that but what concerns me is the wire bundle feels very hard and inflexible. I suppose a bit of heat may soften it up but I'm afraid of damaging it when I move the wiring conduit on top of engine. What sort of tape should I use, will cheap pvc tape quickly turn to goo?
850ivac.jpg
You may also notice that the vacuum line to one of the fuel pressure regulators is not connected. How would this affect engine performance?
Last edited by BMSman; 12-05-2013 at 10:34 PM.
I can speak to the boots between the MAF & the DK. Yes, they are hard and most of it is due to age and heat. I replaced mine, since they're not too expensive. The new ones are a bit more pliable and somewhat easier to work with. Suggest you buy new ones since they are are relatively inexpensive.
With regard to the wiring harness, you may consider stripping off the outer jacket and using self vulcanizing tape. This is just a suggestion. I am sure others here will chime in an offer some better solutions.
I'd recommend you take the whole harness out and rebuild it. But it will be a pretty tough and time consuming job. If you want a temporary solution to tape up the harness, you could use these:
Fire Tape
Quick Fix Tape
It looks like your fuel pressure regulaters are hooked up wrong, the driver side regulator vacume line is supposed to be hooked to the passenger side DK and vice vesa, remember the intake runners are crossed over ( the left one feeds the right side and the right one feeds the left side)
Thanks for pointing this out...
Can you explain what these vacuum lines do? My understanding is the FPR bleeds off fuel pressure back to the fuel tank to maintain the desired fuel pressure in the fuel rail. What does the vacuum line do - modify fuel pressure based on engine needs? Does it really matter if these are crossed?
The Vacuum lines carries any fuel vapor/excess mist back to the DKs to be mixed with airflow and burn off. If they are crossed, it is hard to troubleshoot any FPR or emissions (excess HC, etc.) related issues.
PICT0633.jpgPICT0940.jpgPICT0951.jpg
the vacuum lines control the fuel pressure based on the amount of vacuum produced by the intake. The lower the vacuum the more fuel is allowed to return to the tank, and of course the higher vacuum is going to let less fuel go back to the tank as the demand from the injectors is going to be greater. That is why the vacuum lines need to be hooked up to the correct DKs.
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