89 5.7 running rich

001pewter · May 19, 2019

xx94Z71xx said:
they are cheap to just replace. and they are known for going bad. did u check the resistance hot and cold? dont remember the exact values but last time i had them i found them on a google search.

a bad fuel pressure regulator can also cause a rich condition, along with any type of leaking or seepage on the fuel lines.

I checked it at cold then let the truck warm up a little and checked to see if it changed. It changed as it warmed so I was thinking it's ok. I'll probably just replace it anyway later on. Found these on here I think.

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xx94Z71xx · May 21, 2019

yea thats the chart i used. does the truck idle poorly almost right away? or does it take a little bit of driving for it to happen? i have seen EGR valves that get stuck open and cause a leak, cause the pintle gets all caked up with carbon. i would stark looking for vacuum leaks.

i know u said u replaced the fuel pump twice. im assuming you replaced the filter too? did you ever put a fuel pressure gauge on it?

001pewter · May 22, 2019

xx94Z71xx said:
yea thats the chart i used. does the truck idle poorly almost right away? or does it take a little bit of driving for it to happen? i have seen EGR valves that get stuck open and cause a leak, cause the pintle gets all caked up with carbon. i would stark looking for vacuum leaks.

i know u said u replaced the fuel pump twice. im assuming you replaced the filter too? did you ever put a fuel pressure gauge on it?

When I first crank it, and it's idled up, it seems to run fine. No gas smell or light smoke. After it idles down is when it smells. When I turn the a.c. on it seems to get worse and lightly smokes. I haven't really driven it other than around the yard to test out the clutch.

Yep I replaced the filter with the first pump. I was thinking vacuum leak also cause it sat up for years. I haven't checked fuel pressure, no gauage, I did pull the filter off and both injectors looked to be ok.

xx94Z71xx · May 22, 2019

put a vacuum gauge on it, when its idling rough. should be around 18 - 20hg with a stock cam. its been a while but i think i used the canister purge valve fitting on the tbi to test vacuum. turning the AC puts a good load on the engine, so it should make the problem worse. when you looked at the spray pattern did you use a timing light? any way you can get a video of it running? does the smoke smell sweet like antifreeze?

001pewter · May 23, 2019

xx94Z71xx said:
put a vacuum gauge on it, when its idling rough. should be around 18 - 20hg with a stock cam. its been a while but i think i used the canister purge valve fitting on the tbi to test vacuum. turning the AC puts a good load on the engine, so it should make the problem worse. when you looked at the spray pattern did you use a timing light? any way you can get a video of it running? does the smoke smell sweet like antifreeze?

No I didn't use a timing light, I don't have one or a vacuum gauge. I can get a video of it running. The smoke smells more like gas. I haven't put the shifter boot on yet and it really smells like gas on the inside while it's running.

001pewter · May 23, 2019

The egr valve seemed to be stuck I finally freed it by hand. I took it off and pressed the diaphragm in and covered the hole but it wouldn't hold.

xx94Z71xx · May 27, 2019

if the egr is not staying closed during normal operation then that could be your issue. you could block it off to test it with a block off plate.if you still can get a video send it to my email, i could help better.

89 5.7 running rich

001pewter

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001pewter

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001pewter

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