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Acura Integra Cold Start problem.
Car: Acura, Integra GS, 1991 - Back to Fix-It - Acura Integra GS Repair Manuals
Q.1991 Acura Integra GS Cold Start problem. My car runs well but occasionally gave me problems starting when it had sat for a week or two. Now, it struggles if it sits for even a day. I have always been able to get it started by adjusting the throttle but it's getting more difficult. Now it will partially catch while cranking and then catch but stumble on for 20-30 seconds before starting. It would only do that if I kept the throttle depressed. If I lifted my foot it would die instantly. The odd thing about it is once it starts, it's perfect; perfect idle without throttle, smooth revving, lots of power and will start again with no difficulty. It's only the initial start when it's been sitting. It seems as if fuel pressure bleeds away from the rail over time and for some reason, it doesn't provide sufficient pressure when the fuel pump primes. Most problems I can think of would have more erratic symptoms. Any ideas welcome!
Answer I would start by changing the fuel filter. And check the spark plugs, cap and rotor for wear. It sounds like you either dont have a good spark or low fuel volume. So start there. Use factory parts as there are a lot of poor quality after market parts out there for these cars .
Addition I can't see it being spark or the fuel filter. The problem is too specific to be electrical (it never happens other than when first starting the car after it has sat for 24 hours or more) and there are no symptoms of physical blockage of fuel delivery, for the same reason - and also because the car always runs perfectly. It idles perfectly, has good power, never stalls or stutters and always starts effortlessly, except when it has been sitting for 24 hours or more. In fact, even on those occasions, once it starts, I can shut it down immediately and it will start perfectly right then and for the rest of the day. It seems more like there's not sufficient fuel pressure when starting as if there's a check valve that keeps pressure to the rail when the car is not running that may be slowly leaking or perhaps there is something that is preventing the fuel pump from priming they system properly (although I can always hear it run prior to starting) and don't know why this wouldn't happen in other starting conditions as well.
Answer ok, put a fuel pressure gage on the motor and watch the pressure it should hold for 30min with out loosing 5 psi of pressure. Also watch the pressure when you turn the key "on" and see if it comes up to at least 25 psi within 3 seconds. If its dropping then block the return line and then the feed line to isolate it to either the pump check valve injectors or pressure regulator.
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