View Full Version : Gastester & Colortune revisited – A status report

02-04-2003, 03:58 AM
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Gastester vs. Colortune revisited – A status report.

Otherwise know as how to get your 78 MGB to pass California’s tough smog test.

For those of you who might be curious – due to a few setbacks I am still in the starting gate of my evaluation of the Gunson Gastester and the Colortune devices. But while I am not as far along as I’d like to be right now – fear not I have made positive headway. To date most of the issues I am currently dealing with are the result of years of neglect thanks to previous owners, coupled with a backyard mechanic who hasn’t had to do this much work on one of his own cars in years.

Main trouble spots encountered thus far:
1) Vacuum leaks: Too many hoses, tubes & gaskets to name.
2) Exhaust leaks: As stated in another posting, Manifold to Catalytic Converter Gasket leak.
3) Catalytic Converter Blown out. Discovered this while addressing the exhaust leak – I have a new Cat on order and should have it by the weekend.
4) Smog devices: Air pump & rail, gulp valve and the EGR valve etc. I have had to do various tests spelled out in the Bentley manual to make sure that they are functional.

These delays have allowed me to get familiar with the Gunson devices. Early findings thus far seem to favor the Gastester. This is due in part to the fact that both my shop manuals support the gas analyzer in their procedures. This is significant point to me - in that I need to have my 78B smog tested next month and the more detailed information found in the manuals would seem to be a necessity for that reason alone. But I will not sign off on this at this point.

On that note I seem to have inadvertently found another comparison test between my two shop manuals. Those being the Haynes and Bentley Shop Manuals. But that’s for another day.

John Turney
02-04-2003, 05:50 PM

Thanks for doing the comparison. It looks like you've opened a can-o-worms, though. images/icons/shocked.gif

John, BN4