Just for fun, I switched out the high imp...703 Caravan injectors with the GM 2.3L low imp Multec injectors PN 17103001 that I tried in my earlier 86 3.2 Carrera engine where warm starting was a problem and performance seemed down when compared to the stock injectors. This time, on my 87 Carrera, these Multecs performed amazingly. From an instantaneous startup, idle was noticeably smoother, off the line, mid range and top end even stronger. Totally unexpected from injectors with the wrong flow rate of 19.6# compared to the correct 22# stock ...158 Carrera injector. The only explanation I can think of was that my earlier 86 3.2 fuel pressure may have been off due to wear and my air flow meter may have been out of adjustment.
19.6# low imp Multec
http://www.witchhunter.com/flowdatapix/rp17103001.jpg
Here is a visual comparison between a Bosch and Multec injector:
https://www.google.com/search?q=Multec+mpi+injector+applications&biw=1280&bih=852&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwinr-mcwMfJAhUizIMKHaFKAW4QsAQIUQ#imgrc=o_WLtH1SBuZS9M% 3A
GM Injector Characterization
http://injectordynamics.com/articles/gm-injector-characterization/
Multec Injector Vehicle Fitment
http://www.**********/gb-remanufacturing/multi-port-multec-style-fuel-injector-mpn-832-11116.html
Frequently Asked Questions
http://fuelinjectorclinic.com/faqs/#3
I can only conclude that trying alternative injectors on our aging Carreras is extremely difficult and nearly impossible due to inconsistencies in air flow meter signal or fuel pressure and may be difficult to achieve the same level of success that I have due to these factors. Also, the level of skill required of the installer to be capable of making the necessary adjustments to the air flow meter to match the new injectors is not easily found in most tuners today. In other words, it's not a matter of just dropping in these injectors and driving off, which would be true of any alternative injector.
Cheers,
Joe
Senior PCA member since 1976