Last post on Dec 06, 2013 at 7:25 AM
You are in the Chevrolet S-10 & GMC S15 Sonoma
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Chevrolet S-10, GMC Sonoma, GMC S-15, Truck
#35 of 242 S10 Sonoma 2001 Clicking Sound
Sep 01, 2006 (8:33 am)
Ok, i have a 2001 Sonoma V6 with 107k on it. For the last couple months i have had a loud clicking sound coming from the engine, pretty sure it is the lifters. I personally have no way to get to them without a shop but i'll keep trying.
The problem is this: When i start up cold, i get the clicking and when i accelerate i can redline the oil temp/pressure. At about 3rd gear it'll head back down but every press of the gas will pump it back up. After maybe 5 minutes, sometimes longer, sometimes shorter, the clicking will cease and the pressure stays in the middle of the gauge.
I've changed the oil and filter a couple times, i've used thickener and thinner in the oil but nothing has worked. I spoke to a fella at a NAPA shop and he knew of an oil pressure issue with older GMC/Chevy trucks. He says they lowered the oil pressure in these trucks.
Anyone have a similar problem by chance? I'm stumped and i can't believe it would be my oil pump or anything like that.
#36 of 242 91 S10 4.3 Deceleration trouble
Nov 04, 2006 (9:18 am)
I have a '91 S10 4.3ltr. automatic, 93k miles. This past summer it suddenly started dying as I'd decelerate for a stop. I don't have a tach on the pickup, but it seems the rpms drop too low. It will make a deiseling sound, shimmy and shake, then die. The first time this happened I could not get the pickup restarted. Finally (after many tries), and then after keeping the accelerator on the floor it finally started. I've since not had trouble restarting it, sometimes I have to put the accelerator to the floor, but it always restarts. [On that day I drove it about 8 miles before the trouble started.]
The pickup has had good maintenance. New plugs, wires, fuel filter. After this happened I changed the fuel filter again. That didn't help. I took it to a mechanic and he cleaned the throttle plate and the idle air control valve. He claimed he couldn't get it to die, but it didn't take long for it to die for me. I thought he may be on to something, so I bought a nee idle air control valve and installed it (along with cleaning the area it seats into a little more). That seemed to help for a while, then back it went to the same old die on decel mode. Sometimes I'll just be sitting at a red light and it will decide to start deiseling and try to die.
I've also examined and changed a few of my vacuum hoses, but that has not helped. I tried running a can of Seafoam through it. That seemed to help some, then it got over that and has continued the same symptoms.
I'm suspicious someone could have put something in my gas tank to have started all of this because one of my '04 vehicles started having symptoms a little similar to this at about the same time. I may be a little too paranoid, I don't know. Possibly some bad gas? Wouldn't that have worked itself out by now? I've driven it quite a bit.
I've not had my fuel pressure checked yet. I've wondered it it was safe to disconnect the idle air control valve and see how it runs then. Is that safe?
Any ideas what I should try next?
#37 of 242 Re: 91 S10 4.3 Deceleration trouble [brijar]
Nov 04, 2006 (12:07 pm)
I would change the throttle position sensor. That is the most common cause of this sort of problem and is fairly inexpensive.
#38 of 242 Re: 91 S10 4.3 Deceleration trouble [jneal]
Nov 04, 2006 (3:27 pm)
I had a similar problem on my 92 4.3 a while back. I started replacing sensor with new ones. It started getting expensive guessing which sensor was bad. Instead of forking out 30 - 70 bucks a piece, I started going to the junk yard where they were 5 buck a piece. Then when I found out which one was the culprit I would replace it with a new one.
#39 of 242 Re: S10 Sonoma 2001 Clicking Sound [the_goat]
Nov 18, 2006 (7:59 pm)
I recently traded in my S10 with 91K miles. It had that clicking noise when cold. Some call it a "piston slapping" problem. I switched motor oil to the 75k oil for high mileage vehicles (10W30). It helped a bit. The best thing to do is not to accelerate too quickly or rev the engine right after start up. Otherwise, I believe there is nothing that can be done short of a tear down of the engine. Good luck.
#40 of 242 Re: s10 fuel pump problem? [cpl123]
Dec 21, 2006 (10:46 am)
I am willing to bet that you have your problem fixed by now but I am going through the same problem now. Man it could be anything from a crappy ECM to pressure reg (i have a throttle body) clogged fuel line, filter, plugs, MAF, anything. After you pressure check your system, the pressure should be between 9 and 13 PSI. Since you changed your pump, I would lean to an injector. Best of luck
#41 of 242 Re: s10 fuel pump problem? [lithiumed1]
Dec 28, 2006 (11:48 am)
Any luck with your issue? I am having a very similar issue with my 94 Sonoma 4.3L. I replace the fuel pump, sending unit and filter, but it is still losing fuel pressure. I assume there is no signal getting to the pump, but not sure where to start looking (ECM, relay, ignition wiring?). Any ideas would help.
#42 of 242 Re: s10 fuel pump problem? [jrocko]
Dec 29, 2006 (8:16 am)
First of all, there are two 4.3L engines available. One is with CPI (central port injection) and the other is a code Z engine or throttle body. You didn't specify in your post which one you have.
You mentioned that you replaced the fuel pump and it is still losing pressure? Where are you taking the reading from? If you turn the key to the ON position, can you hear the pump run?
Could you have a bad "new" pump?
I had a problem on a 95 2.2 Sonoma that started and ran well for about 2 miles then would bog down and die. I put a pressure gage on a "T" fitting right after the fuel filter going towards the engine with a long enough hose so the gage could be duct taped to the drivers window. That allowed me to monitor the pressure as I drove. Sure enough, when the pressure started dropping, the engine bogged down and eventually died. It happened on acceleration only. It would idle ALL DAY LONG if I let it without any problems. Once I pulled over and shut off the engine, I could restart immediately and go another couple miles.
I used to believe that in-tank pumps would either run or NOT run. I was wrong. I replaced the pump assy and connecting hoses in the tank and it was all taken care of. Ran like a champ once again.
If this problem you are having is repeated every time you drive, and accellerate, then I would say your pump or since it is new, the interconnecting hose is bad. I can't remember what they called that piece but I replaced it to eliminate having to pull the bed back off to get to the fuel tank again. It's a little more expense but will keep you from having to guess and sliding the bed off to the side once more.
#43 of 242 s10 stalling fuel rich
Dec 29, 2006 (10:06 pm)
I have a 1995 s10 4.3 ss package motor bored and built not sure to wat spec. i have had it for 20,000 miles and drive it everyday, burns a quart of oil every oil change. But no noise and runs fine other than the stalling. i have changed fuel pump, fuel filter, egr valve or regulator. I have a cousin that runs a motor shop and has hooked the comp. diognostic to it, it says bad sensor which i changed and fuel rich. Cousin said could be a wire grounding out. i hear it pulling air wen it misses. dont know any suggestions be more than glad to listen.
#44 of 242 Hey thanks
Dec 30, 2006 (1:19 pm)
Hey i never did change the hoses leading to the pump or that assembly. The only thing is my truck never dies. It just has like a miss in it but wen u put the accelerater to the floor it runs fine. Its sometimes backfires threw the number 4 cylendar im thinkin it might be an injector. I guess that might cause it to run rich. idk confused. But i will try to change that assembly or hoses u were talkin bout.