the number 8 in the vin is for the base model engine which is the L98.  the "9th" injectoer is located on the driver's side runner in between the 2nd and third tube. might just be another injector that only activates when cold, not sure as my 90 does not have one.

[QUOTE=jeffjets55] Yes, I just bought a set of new 22 psi Borsch injectors on Ebay. FYI, the seller said look the VIN. If the eighth digit is an 8 the 22 psi injector will be the exact replacement required and matches the OEM injector. I'm having a hard time finding the ninth injector you refer to as the cold start injector. Is it a switch?  i found a cold start switch. Is this what I need? I also bought an upgraded fuel filter too.[/QUOTE] I don't believe the cold start injector is available any more new. I suspect what you're seeing for sale" cold start switch" is also known as a thermo time switch. This switch contols when and how long the cold start injector is activated depending on temperature. There should be a procedure in your FSM for checking the "cold start" circuit. IMO the thermo time switch gave more trouble then the cold start injector itself--which is likely why the "switch" is still available. SAYWHEN2011-07-21 11:00:17

Thought I'd dust off this old post to find if there's been any new info for harder starting when warm. In the morning I don't think mine cranks over a whole rev and she lights. Great...ready for the day. Then when I leave the office and turn her over there's usually 3 - 5 seconds of cranking and when I release the key she'll catch and stumble to life. Runs just fine after that. Funny how just as I'm thinking of giving the starter a rest like clockwork the engine lights just as I release the key. I've checked out the cold start thermo switch prices and that's nuts what they get for those. I don't mind spending $15- $20 to try out a hunch but at $130 for the thermo switch, I want to be pretty sure I get good results. I don't see any harm in disconnecting the 9th injector during the warm months. If seems to lead somewhere I might even wire in an under dash switch to enable/disable the cold start circuit. Anybody had a problem with the ignition switch itself that caused symtoms like those? Just one of the small bugs in my otherwise good '87.