BG: I have an e21 with a swapped M20B25 from a 1989 325i. New fuel lines, new o2 sensor, no vacuum leaks, gaskets good. Didn't change injectors or other sensors. (Purchased from a good guy on this forum)
Occasionally, when starting the car cold, I put it in gear to move it or something before letting it sit and warm a bit. If it warms up - no problems - the car just scoots and the engine is great.
If I don't wait a minute for it and just move it a few feet, i.e. rev it up, when it settles back to idle, it will hunt or surge a bit until it warms more. When it is warm, it's fine.
Any idea what this could be? Coolant temp sensor?
Possibly related issue: when doing my first high-speed high-rev run (post swap) through some twisties, we noted a fuel smell, kind of like it was running rich. No evidence of a leak anywhere visible. When driving at lower rpms, there is never such a smell, even if it is high-speed highway cruising.
Thanks for any input.
Pic of swap for the hell of it:
Occasionally, when starting the car cold, I put it in gear to move it or something before letting it sit and warm a bit. If it warms up - no problems - the car just scoots and the engine is great.
If I don't wait a minute for it and just move it a few feet, i.e. rev it up, when it settles back to idle, it will hunt or surge a bit until it warms more. When it is warm, it's fine.
Any idea what this could be? Coolant temp sensor?
Possibly related issue: when doing my first high-speed high-rev run (post swap) through some twisties, we noted a fuel smell, kind of like it was running rich. No evidence of a leak anywhere visible. When driving at lower rpms, there is never such a smell, even if it is high-speed highway cruising.
Thanks for any input.
Pic of swap for the hell of it:
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