1989 C1500, EGR, Headers Question

[FullBlowncustoms]

One last question please.... Does your 91 have the fuse, relay, things box on the firewall or on the drivers side inner fender like my 95 truck pic I posted earlier? Thank you...

 

[Drunkcanuk]

One last question please.... Does your 91 have the fuse, relay, things box on the firewall or on the drivers side inner fender like my 95 truck pic I posted earlier? Thank you...

Up on the firewall.

 

[FullBlowncustoms]

Up on the firewall.

Awesome... Thank you !! that takes some thought out of it that you posted the year of yours... So I can check part numbers on the sensors I used in this 89.... I assume the same though... Very cool !!! Great info !!!

 

[evilunclegrimace]

My plugin under the driver side dash has 6 terminals on top, two on the bottom far left. If you are correct about 5 on top? maybe this 89 is a mismatched parts build? IDK....

You must be registered for see images attach

 

[evilunclegrimace]

Ok, thanks, I'll check few other things mentioned. Seems to run lean I think... Maybe fuel pump relay? I been thinking the fuel pressure you mentioned. And yes the United Billet Distributor looks nice that I put in...

NO ,if the pump is running the relay is working as it should. You need to check fuel pressure with a gauge to verify. Stop guessing! You are making your job more difficult than it needs to be

 

[FullBlowncustoms]

Ok UPDATE: You guy's can list me in the stupid man category LOL. Few days back I put in the new Billet distributor, and oil pressure sensor. Started it up, timed it once it was warmed up. Then I rev it up a few times. Vibration was gone got a big smile LOL. Ran nice with a steady rev holding it in driveway, not running lean anymore or any more vibration, no miss or stumble etc anymore... I assumed it had no vibration because of the new distributor.. WRONG!!.... Drove the truck for like 2 plus hours, ran AWESOME... (It usually would fail at warm up in driveway) So I knew it was fixed!! On way home I got close to my house, I lit the tires up giving it hell, let off and turned on road to my house, as I came down my road the vibration was bad again, felt lean... I stopped at my driveway to back in, oil pressure DOWN, idle DOWN, Sputtering like It skipped a chain tooth from giving it hell, put it in reverse and it about shut off. Today I lifted the hood to find area for fuel pressure test instead of under it at the filter.. Take the air cleaner off and see oil by distributor on a VERY clean tranny housing. The oil pressure sensor I put in was off ebay china part $9.00. No shop in my town had one. I reach in behind and pull the plug off the sensor and oil ran right out the end of it. The BLUE rubber seal on the fitting fell right off it was soaked. looked, felt etc all around it for the leak, was dry mostly... Start it up look real quick at it and sure enough it is running straight out the plug terminal end !! So in a sense everyone was correct, lean, fuel pressure etc.... So was that sensor all along, RAN GREAT for 2 hours though, until I really hit it at WOT LOL... The diagnostic A-B terminals still never get a connection to read the flashes, My 95 truck I tested and works fine. Not sure why, but it doesn't effect the performance any..

 

[FullBlowncustoms]

The day it happened about 500 yrds from my house, I parked it and put the cover on. Went to Advance Auto and bought the best Fuel relay they had. I never put it on that day. Then the other night I asked if the relay would do that? EVILUNCLE said no.... So this morning being already bought I went to put it on, and seen the oil.... TUPID ME.... China junk in a hurry. The old orig did not work, but it NEVER blew out at the Wire fitting !!

AND, Thank you to all you people!!!!

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[GrimsterGMC]

It's always good to see a positive outcome, even if it means having to admit to a mistake. I call this a win.

 

[PlayingWithTBI]

When you turn the key on, engine off, does your SES light flash on/off once, then come on steady until you start the engine? If it does, the light bulb is good AND the ECM is working. Now we need to figure out what's wrong with your ALDL connector and wiring...

If I had to guess, something's wrong with your O2 sensor and when it goes into Closed Loop. Without a scanner, it'll be hard to diagnose

 

[Scooterwrench]

Basic rule of thumb is to buy AC Delco for all your sensors. Still made in china but to a higher standard.