So, I'm experiencing some issues that have me a little puzzled with my '97 R.

The primary problem is a very noticeable loss of power when the car warms up. It doesn't overheat, according to the factory gauge, but when it reaches the mark right before halfway there is a definite change. If it's indicating somewhere between the first few marks it runs much stronger, and is more responsive. It's almost as if the car feels heat-soaked, though it isn't indicating overheating.

Also, I recently had a chance to dyno the car and the numbers weren't good. 147 whp and 113 trq. The motor has about 20,000 miles on it, and a compression test was done recently with very good numbers.

The shop said it felt like it had a misfire as well on the dyno. I ordered parts for a tune-up, which hasn't been done since I bought the car a few months ago.

So, the power output could be related to the temperature change, or maybe not. Couple guys at the shop said to make sure the motor had the correct cams in it, maybe that's a possibility. Possible ideas for the temperature related change I've had so far are maybe clogged cat, bad IAT sensor etc.

Figured I'd have you guys weigh in with your experience. I'm going to scan the dyno sheet and post it up as well, it's fairly choppy.

-Ben

 

Do a leak down test in the cylinders.

 

And check your valve clearances. Do a valve adjustment if neccessary.

 

exactly what i was thinking, do your tune up and while your at it adjust your valves.

 

Okay, I'll check the valves while I'm at it.

 

I know the ignitor in the distributor can be affected by heat (slightly different symptoms though). Checked the oil and coolant levels I'm assuming? Make sure to grab a new thermostat part of your tuneup. Just good practice. Have you pulled your plugs and checked them?

 

Yeah, first thing I did was check them, plugs looked good. I'll grab a thermostat while i'm getting the other stuff too.

Also had just changed the oil, and the coolant is good.