Quote:
Originally Posted by Diseasel300
This engine is CIS, not multi-point injection. ALL SIX injectors flow fuel all the time at various rates, the fuel "distributor" as it's called, doesn't inject to various cylinders like EFI does. Which cylinder is "up" and which valve is "open" has absolutely nothing to do with what the fuel system is doing.
Replacing all of the injectors and seals straight away is expensive, time consuming, and likely isn't the problem here. Can they cause problems? You bet! But I'd be surprised if that was the issue here. If you had injector issues, I'd expect running issues such as stalling, rough idle, missing out, lack of power, etc.
I'd be willing to bet this is a supply issue, either vapor lock, something leaking down (check valves and such), or an enrichment issue such as a cold-start injector that isn't firing or an idle solenoid that's stuck closed.
It's easy enough to test if the idle solenoid is stuck closed. Simply pull the plug off of it. You should have a very fast idle (1500-2000 RPM). When you reconnect the plug, the idle should drop back to normal. The solenoid is a "pull to close" design with a spring return, so disconnecting the plug will force it "wide open". If the solenoid is stuck or sticking, you won't get much of a change if any at all.
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I have owned a cis run car for almost a decade, I can tell you I understand the system very well.
Injectors leak, will clog partially, or will otherwise figure out a way to dump fuel in to the cylinder. If the valves are closed, the dripping fuel has nowhere to go. This resulst in the chugging feeling that ou get when the car starts.
If the valves are open, the fuel will dissipate, and the result is longer cranking times while the unit regains pressure in the upper chamber is the fuel dizzy.
You are right, bad injectors can cause the above issues, but most likely you will just have a slightly lumpy idle , and decreased MPG (slight)
I spent a year chasing down the same issue with my 300e back in the day. After changing basically everything and giving up, a friend gave me a bottle of redline fuel additive. My problems resolved 90% with the redline, and the car was 100% perfect after changing injectors/seals/holders.