With new polished stainless headers, all primaries have turned a nice gold color except cylinders 1 and 2. Engine is unmodified from a 1990 Mustang GT that ran perfect. Good spark and fuel injector pulse to both cylinders. Is there anything else I can test short of changing fuel injectors.
What I meant by swapping injectors was to move them around the engine and see if the problem moves with them.
It could just be junk in the injectors blocking flow. A rebuild kit comes with new filters, new pintle covers, and new o-rings. We did it a few weeks ago on Ryanh's injectors more as a preventative measure than because they weren't working, and it gives you a chance to test the injectors individually with a 12v source and a momentary switch.
I haven't seen anything about "type 1 or type 2", but I'm not the one who bought the kit.
Ryanh got his kit from fuelinjectorconnection.com. We made our own pressurized fuel system for cleaning and testing with rubber fuel line and a nipple for the air compressor, and connected a 12v power source and momentary switch to the injectors so we could pressurize the fuel, use the switch to open and close the injectors, then we put it all back together once we were done.
Looks like that site also offers injector restoration, where they'll do it all for you.
how do the plugs on those two cylinders look compared to the rest? How does the car run? If you were completely missing 2 cylinders, it would be pretty ratty. A compression test or leakdown test would confirm or rule out something compression-related (head gasket, rocker adjustment, etc). Check the obvious too....perhaps those two plug wires are swapped?
Checked primary temperatures. Cylinders 3 & 4 ~ 650F, cylinders 1 &2 ~300F. I am going to check plugs and do compression a test tomorrow. The engine seems to idle and run fine. There is some light backfiring from that side at low rpm acceleration. I unplugged a fuel injector on the other side of the engine and only had some power loss. The engine still ran and idled fine down another cylinder. Plug wires are new, spark plugs are new, getting good spark (held the boot next to the header with the engine idling). Getting good injector pulse. I am going to order the fuel injector rebuild kit mentioned above. I figure 22 year old injectors, it won't hurt.
I had my injectors cleaned and flow tested at this place...local for me. They did a great job and it was only like $15 per injector. Good luck!
Wally's Injection Service
1556 S 300, Salt Lake City, UT
FFR6966 - MK3.1, IRS, AFR 205 headed 408w, depleted bank account, pissed off wife, friends think I'm a hermit, dreaming of driving the Cobr@ someday. My Build Site PS Footbox Mod .pdf.dwg Tire Stencils .pdf.dwg
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