89 Chevy Silverado issues.
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the truck isnt throwing the code 43 right away, as I understand it does a test on every start cycle. I erased codes, ran it for abt a minute then rechecked for codes, it was clear. then I started it again and let it run. it seems like the idle surging got progressively worse. I read that the computer will keep either retarding or advancing the timing in 1 degree increments to attempt and cause an engine knock. so im thinking this could be the issue. I can take pics of the sensors in speaking of if needed. it looks like the wire going to the sensor on the opposite side of the block, was spliced in. it is seems it was done by someone who at least knows what shrink tubing is. so folks, it seems we have another scooby do mystery to solve. as I said my oil pressure sensor is near the oil filter, not near the distributor as many seem to be. the sensor in the block had to be for something but there is no wire that goes to it, or a wire nearby that isnt plugged in,, the sensor in the opposite side of the block from the sensor in front of the starter looks a bit different., it does have a large black rubber connector plug on it,.
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attached is the part im speaking of. possibly the circuitry in it is different, I didnt pay attention to what year truck it came off of.
I tell ya I will never by a truck again where half the engine and electronics are missing and the other half have been installed in the wrong locations.
this is getting ridiculous,, the only reason I think there would be a second knock sensor is maybe they couldnt get the original one out, and removed a block drain, installed it on the other side, and spliced an extension wire to reach. they are only supposed to be torrqued to 14 ft pounds,. shouldnt be stuck in there.
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Someday I'll figure this out
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I cannot find any info on how the spark timing module works anywhere. Im thinking it must send the signal to the knock sensor thru the ecm. only a single wire on the knock sensor, so its output only, I think the ecm runs the program to retard the timing in one degree increments until the engine knocks, the sensor then sends a a.c voltage to the electronic spark sensor which may convert the signal to a dc voltage that lets the ecm know that the knock test either passed or failed. if passed computer goes back to its normal parameters, if failed check engine light. I have no check engine light coming on, so my sensor must be sensing a knock,, but with that 92 octane, it may be taking the timing quite a bit off the base, to make it knock, hence the little short term idle ramping episodes every now and then. . its been off all night, cold outside im going to go start it up and see what it does this morning.,
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The knock sensor gets checked at start up or near wot. The ecm wants to see 8 to 10 volts from the module all other times meaning no knock and other than the start up check,won’t use it below 900rpm. It mentions single blue wire from connector to sensor.dont run it near anything that would induce voltage, keep away from plug wires.
Someday I'll figure this out
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Someday I'll figure this out
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what happens alot around here, every joe blow and thier brother goes to these COPART auctions. if they get something good, they flip it for good money, if not so good, they try to flip it for what they paid or a smidgion more. they just want to get rid of it because they dont have the space. they always have a big story with it, like its been in storage, wife got tired of it, someone stole car and took registration sticker off and plates. yada yada. they never get the vehicle registered in thier name, its still in the title holders name. Its not an easy task getting the truth out of people anymore. the guy who sold it to me delivered it, he dropped it off and hauled azz. like he was abt to have a digestive emergency.
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Someday I'll figure this out
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Just for the Halibut, im going to order a fuel line tee and see what my pressure is running, and I may take the injectors back out and do a bench flush on them. really clean them good and see what happens. like I said sometimes it idles for several minutes, then if I rev it a bit, or drive it, it goes into like a little diagnostic slow ramping surge a few times, then levels back out and idles ok.. it seems to be either relearning something, or throwing a test out,. with everything out of whack the way it was, I think it may be trying to fine tune itself, either that or its not getting results it wants from something and its checking again.. thats what it seems like . If that little "hunting cycle "every so often would go away, it would be perfect.
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Someday I'll figure this out
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Someday I'll figure this out
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I ran the truck a while an it seems like once its warmed up good, it idles really well and steady. with the cold nature of these trucks and large radiators, It may also be switching back and forth in open loop a bit, and causing the little "episodes"< when it is warmed up good its quite steady and smooth. its like flipping a switch when it does it, then flipping it again when it comes out of it. and the engine is not in danger of stalling, it doesnt drop down that far, just enough to feel the stumble. I watch the floor shifter when its idling and it is fairly still, just a slight vibration coming thru it, and moving just a slight amount. If I had a scanner that I could see and verify this it would be cool. in hot weather I may not even see it do this. when its 105 F out it doesnt take the engine long to get to 180F. if its hopping back and forth out of closed loop, then the IAC and tps would be controlling it, and the TPS does control timing and fuel. the IAC just air. this would make more sense than the knock sensor theory.
looks like the 02 sensor comes online at around 600F. Uncle Haynes isnt too clear in the manuel on what function the 02 sensor has, though it does say it helps control fuel. Haynes makes better drawers than repair manuel s by far.!!
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Someday I'll figure this out
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got a drip coming from rear main seal, have u ever tried a product called AT-205 RESEAL BY ATP.. It has a 4.5 star rating and scotty kilmer said he used it with good results for 20 years. I was told that the clutch was replaced before I got the truck, from the guy I got the truck from but people lie so much Its hard to believe anything anymore, . I couldnt imagine not replacing the rear main when they had the manual tranny off, but hey , its 2019 . im hoping it got a little shrunk from sitting likely a year 0r more. anyone who doesnt change a 10.00 seal that takes 2 minutes or less when they have the transmission out would be amazing to me, I will try the stuff and report how it works. had neck surgery in jan and surely cant be pulling the transmission on it for a while.
also anyone who does a rear brake job, DO NOT use brake best hardware kit, the e clips that hold the E BRAKE lever onto the shoe is defective., Im fixing it permanently, I drilled a small hole thru the pin, pushed it brake pad and lever, put washer on other side, and small cotter pin in. a roll pin could be used as well. what happens is that E CLIP comes off, or breaks, then pin pops out, falls into brake hub, and the E brakes dont work anymore.
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