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Old 08-11-2015, 10:10 PM   #15
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just my 2 cents,have you checked or replaced 1 or both of the coolant temp sensors? temp readings can be monitored on a tech 1 scan tool. i have a snow plow truck with the same lean back fire threw the throttle body. New temp sensor (ecm) fixed it!
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Old 08-12-2015, 03:04 AM   #16
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Originally Posted by sledwest View Post
just my 2 cents,have you checked or replaced 1 or both of the coolant temp sensors? temp readings can be monitored on a tech 1 scan tool. i have a snow plow truck with the same lean back fire threw the throttle body. New temp sensor (ecm) fixed it!
the whole engine has been rebuilt. all sensors. no codes. great power in the city. just up a hill starts to glow within 20 seconds. Easier noticable at night of course. Timing is correct! New manifolds, already drove without a catalytic converter inline and it made no difference. No exhaust restrictions either!!!
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Old 08-12-2015, 05:23 AM   #17
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Can you put a fuel pressure tester on it while you drive to verify that the fuel pressure stays at 12- 14 psi under a load.
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Old 08-12-2015, 08:11 AM   #18
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Yes these are brand new inectors!
They made injectors in different flow rates for different size engines. Only the Dark red / Dark blue color coded injectors are rated for 90 lb/hr flow rate. The blue / black were rated for 80 lb/hr. All of the other color codes were only used on small block engines such as orange / Black rated for 55 lb/hr used on 5.7l engines.

What color code injectors are you using?

17113080,17104288,17113081 are all rated for 80 lb.

Back in the day, I have even changed the fuel pressure regulator spring from black which is 11-12 psi to a yellow spring that increases the fuel pressure to 14-15 psi. You can get an extra 2-10 lbs out the injectors with this trick.
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Old 08-12-2015, 09:20 AM   #19
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silly question when the engine was rebuilt, did you paint it? if so, did you grind to clean metal the area where the ecm grounds? if there is a voltage drop due to excessive resistance (paint) on the ground side, it will throw off all calibrations of the ecm. you may wish to pin out the ecm and check to see what actual readings the computer is seeing. Why? you may have a sensor that is reading correctly but thru resistance in the harness, by the time the signal gets to the ecm it is skewed.
also, try taking an alternate fuel source ie. a can of carb cleaner, and gently begin spraying into the throttle body while you are under load. Does the engine bog or pick up in acceleration? does the glow go away? can you hook up a voltage meter to the o2 (single wire I presume) and read the under load voltages? should exceed .450v and trend closer to .800v under load. Let me know ;-)
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