I drove my yellow Spider (phase-2, CF2 engine) recently for the first time in a while (had to buy it a new battery), and I'm not happy with the performance. It's very smooth but quite difficult to pull away from rest (bogs down easily), as the engine seems to lack power at all speeds. It has been like this ever since I got it in September. Even at full throttle through the gears the acceleration is leisurely, 0-60 in about 17 seconds (timing with a stopwatch).
Earlier this year I had a new exhaust system made up, as the two main mufflers were rusting at the seams. The 1st and 4th mufflers were good. This didn't make any difference to the performance, but has restored the nice sound. There are no flat spots in the rev range and it really does run smoothly.
Also earlier this year I replaced the cambelt, using locking blocks to ensure the timing is correct. I was disappointed to find it was correct!
The previous owner had the MAF replaced with a new one, at great cost. I expect the previous owner was chasing the same problem...
In January I had a red phase-1 Spider Twinspark and that seemed to go like a rocket in comparison to my phase-2. It convinced me that perhaps I didn't need to save up for a V6 after all... also I used to have a 2003 156 with Euro-3 Twinspark engine and that always went well too. So I'm sure my yellow Spider can do it. It has about 100,000km on the clock (62,000 miles) and is in excellent condition, well-maintained throughout its life. I have also replaced brakes and rear wheel bearings plus a full set of new Yokos (tyres) so there isn't a rolling resistance problem.
Please give me some ideas on what I can do/check
Perhaps I should start with the airflow meter again, since there's a chance that it's the wrong one or faulty? Or is this a possible Lambda sensor fault symptom?