So I was running MS-II with Abe's PNP board a few weeks ago. I had this little issue where one night I drove my car to work (started fine at home) and when I went to leave work, the car just cranked and cranked. So I got the car towed home and yanked the MS and the board, and plugged the stock ECU back in. I am still running stock injectors and my car used to be MS-1 in parallel with 460cc injectors. Now when I went to swap my stock injectors back in I noticed my little black (I guess pintle caps?) around the stock injectors were cracked. So i removed the black plastic caps and put the injectors in anyway. Then I plugged the stock ECU in and have been running the car this way since. I drove the car to work (28miles one way) yesterday, with no problems. I drove it today, went to a gas station where I filled up, and when I went to crank it over, it just cranked and cranked. It sounded it like wanted to catch, but it sounded flooded. EXACTLY like it sounded the night it left me sit when I was running the MS-II with the PNP board.
So my question is this:
What do those little caps on the stock injectors do? I am guessing that since my car has 140,000 miles on it and those injectors are possibly F'd up, it's not "misting or atomizing" the fuel, instead it's more like a "drip or stream". Cause this flooding effect? What do you guys think? I am running everything that is stock on a '99 motor...stock coils, wires...maybe someone else had a similar issue?

 

I've had a very similar problem. It ended up being my fuel pump was bad. Sometimes it would catch and run. Sometimes it wouldn't turn on at all and just strand me there (well I wasn't really stranded, it was in my driveway) It was weird because I would come out a little while later and try to start it again and it would fire right up without doing anything to it. What struck me down was, if it was loose or going out, that going over bumps in the road didn't somehow shut the fuel pump off and just kill the car. This may be a good place for you to start, especially if you haven't changed out your fuel pump yet. One way to check to see if you think it is flooded is to take your spark plugs out and smell for gasoline. Another way, my personal favorite of getting gas everywhere (not such a smart idea) would be to disconnect the fuel line near the charcoal cannister put a rag on top of the hardline (so you don't turn it into a squirt gun and shoot fuel everywhere) and see if you are getting fuel to your inj. I would only do this at the period of time when it is acting up. Also for just some basic maintinance, I would check out your fuel filter. It is located near the passenger rear side enclosed in a black looking box. It can sometimes be a pain to take this out. I advise using a fuel disconnect line. I've heard of some people who have had fuel cut offs due to bad filters. But........ This is only some of the fuel aspects to as why it could possibly be acting up on you. I would check this along with the spark. Check to make sure you are getting spark at the plugs, and the coils. Take out one of your plugs and put your spark plug wire back on it, then your going to need some wires to wrap around the threaded body of the spark plugs and ground it somewhere. while you or a friend is holding the wire on, turn the key and see if the spark plug is getting spark. Do this for all of your cylinders (risk of getting shock). Luckily i've never been shocked by doing this. But my guess would be on the fuel pump. Your car would have bogged down if your not getting proper spark I believe, or atleast thats what happend to my car when the wires were bad and not contacting the spark plugs well.

 

I was in "I'm fed up with this car" mode today, so I didn't tinker with it for more than 1 minute. I did turn the key on and I'm sure I heard the fuel pump. I also pulled plug wires 1 and 2 and laid a spark plug on the valve cover and cranked it. I didn't see any spark, but I don't think I had a good ground either. I'm gonna try a clip jumper on the plug to ground tomorrow.
Maybe my coils are on their way out?

 

When it's not starting, take all plugs out, keeping them in order, and take very good macro photos of them for us. That might help. And check for spark on all 4 cylinders. It should be fairly easy to get a ground, it'll work fine on the VC. I've carefully put all four there and watched under the hood while I was cranking it. Looks cool in the dark too.

 

Plugs look good and I grounded them while in the plug wire boot and turned the key, no spark from either coil. I had a '91 a few years back and I had a similar problem with no spark, I changed the coils, the CAS, and still nothing. Turned out it was a broken timing belt! I didn't pull my timing covers yet on this car, but what else would cause no spark? Aside from a broken belt or bad coils.