Join Date: May 2011
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Engine RPM acting up
I've been having two issues with the behavior of my engine RPMs:
1. When coming to a stop, coasting in neutral (or with clutch depressed), the tachometer will fluctuate between ~800 and ~1500. Shouldn't just stay at idle? The problem is worse when I'm at very low speeds right before I stop, it (sometimes, not always) dips down really low and the car ALMOST stalls. For a split second the car shakes and the lights on the dash flash. Besides this being annoying, I don't want people in parking lots to think I'm revving my engine at them.
2. When driving and trying to accelerate, if I give it a lot of gas (not necessarily flooring it, but more than regular acceleration) the RPMs go up pretty high, near red line if I'm on the highway or something. Then it will go back to normal when I let off the gas. It's behaving kind of like an automatic car would except that I'm not downshifting which is what an automatic would do. I was under the impression that in a manual it should just gradually increase RPMs as speed increases.
I cleaned my MAF and IAT sensors and they were dirty but that didn't help. Other things to note are I have an Injen CAI, a Unichip Piggyback (to prevent CEL), and Magnaflow Cat-Back exhaust. The CAI and Piggyback however were installed before I bought the car so I'm not very familiar with them if they might be causing the problem. Any suggestions for either of these issues would be much appreciated, thanks.