My 87 Si (I guess we can just think of it as a 87 LX-i) has been having difficulty starting when warm. The symptoms are:
-starts perfectly fine when cold (as in engine fully cooled) and runs well overall, even when fully warmed up.
-if it's been sitting for anywhere between 10 minutes to 10 hours (which I'm gonna say is "warm") it takes extended cranking and when it finally fires off it stumbles to idle. Soon after the hard start it finds idle ok.
-after a hard start, it idled fine until I drive it in traffic. Prior to full warm up the idle will stumble when I'm stopped in traffic. The stumbling lasts 5-10 seconds then the car instantly finds a smooth, normal idle. 20-30 seconds later the process repeats. The difference between stumbling and good idle is like an on-off switch.
- sometimes the car will misfire (after the hard start) when I drive it, it's a full power loss misfire.
- following a hard start the exhaust reaks of unburnt fuel. The harder the warm start, the stronger the smell.
Things I've done:
- inspected TW sensor. Passed.
- no ECU codes.
- new Bosch cap and rotor, Denso wires, NGK plugs. No improvement
- inspected Main Relay. Passed. I am going to resolder anyway when I get a chance.
- cooling system flush and proper bleed of cooling system.
I'm at a loss. My opinion is maybe a distributor issue which in my estimation explains the raw fuel smell, and sensitivity to a not cold engine.
What do you guys think?
Hoping someone recognizes this issue and knows a solution.
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