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Message: [QUOTE="B585Ford, post: 353070, member: 5497"] A chemical test won't mean chit!!!! EGR failure or HG failure will cause a positive chemical test. The pressure test can help you in trying to determine the cause of the puke...a bad cap (which we can probably rule-out due to coolant in the exhaust) you will never get to a pressure of 16 (the pressure at which the cap is suppose to release). If it is HG, when you are driving and floor it (or do whatever it takes to get it to around the conditions in which it pukes), the gauge will rise to 16 and drop to around 14 and hover in that area for a quite a while even after turning the truck off. If it is EGR, then the gauge will likely go up and down with boost more....if you floor it will rise to 16 and then when you let off it will drop a lot more. It cost me $16 to build and IMO is the most accurrate to determine if it HG versus EGR. Not a perfect test, but I have never seen it point in the wrong direction. Disclaimer: I have only helped perform it on 5 trucks. I have seen a positive chemical test with confirmed EGR failures. [/QUOTE]

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