Hi Folks, Did a compression check today, and need some help finding what these numbers really mean. Here's the results: Cylinder #1: 125-130 psi (9 bar) #2: 145 psi (10 bar) #3: 140 psi (almost 10 bar) #4: 145 psi (10 bar) Test done per Bentley, car fully warmed up, accelerator floored. Test tool was a universal compression tester from NAPA (not easy to use, but re-checked results for cylinder #1 a couple times.) Cranking/rise times pretty even. Other info: 88GL(manufactured 87), 116k on engine. Exhaust/cat non-stock, and in poor shape (see later note). There were some long standing FI problems, now fixed. 950 miles since last oil change(10w40), very little to no oil consumption (have topped off once), and the oil itself looks pretty clean. Plugs look similar, no fouling. 22.5 mpg on last long trip, though this is mostly an urban daily driver (Brooklyn NY). I'm shopping for a new exhaust system, and did the comp. test to figure if I'd be throwing away resources on a not-long-to-live engine. Right now I'm pleasantly surprised by cylinders #2-4, concerned by the unevenness of #1. How bad is this? What causes and cures? Which hole do I stuff money into? TIA -Matt Sutton |
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