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Chevy S10 - GMC S15 and Sonoma Oil Questions

33 messages,  Last post on Oct 14, 2009 at 9:15 AM

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#26 of 33 Re: 1995 sonoma [fstuter] by hoodlatch Jul 27, 2008 (3:12 pm)
Replying to: fstuter (Jul 24, 2008 10:09 pm) It sounds like the oil pan has to come off to find the culprit. My neighbor had a similar problem with is 2000 4.3. Once we got the oil pan off we found it spun a rod bearing. Sometimes if routine maintenance isn't done the oil pump pick up screen gets clogged up. Sometimes the oil pump gets week. 94K miles is pretty low for a 1995. I would think the bearings are in pretty good shape if the engine hasn't been dogged out. Is it possible your oil-sending unit isn't lying to you? I just change out one on my kids Corsica. It had an aneurysm and was leaking oil very drastic. They’re inexpensive and not too hard to change out. I used a deep wall 15/16th. I would prefer to do that first before dropping the oil pan. In my neighbors case it was a 4.3 in a full size van and it wasn't any problem getting the pan off. On a Sonoma you'll probably have to loosen a few things and jack the engine up to get the clearance. Good luck.
#27 of 33 Re: 1995 sonoma [fstuter] by bsedmundson Aug 01, 2008 (10:16 am)
Replying to: fstuter (Jul 24, 2008 10:09 pm) My 95 blazer oil press drops at idle 20-25 psi then at normal rpm 40-45 psi has over 200,000. try and install a gauge to see real engine press. other than that it all guess work Replies to this message: gonogo (Sep 14, 2009 8:33 am)
#28 of 33 oil pressure high by enzo14 Sep 12, 2009 (3:02 pm)
i have a 00 sonoma 2.2 and when i start it the oil pressure shoots up almost to 80. theres 123k miles on it and when i come to a stop it comes down to about 40 but then goes back up when accelerating. i drove it today into town and for the first time it started shutting off a couple times at stop. the temp is normal. also when it shifts into 2nd when its cold it has a pretty noticeable kick.??? i checked the oil and its fine. also checked the tranny and is a little low.
#30 of 33 Re: 1995 sonoma [bsedmundson] by gonogo Sep 14, 2009 (8:33 am)
Replying to: bsedmundson (Aug 01, 2008 10:16 am) That sounds about right for a 4.3, the 4 cyl runs higher.
#31 of 33 1995 S10 2.2L by dfmartin Sep 27, 2009 (6:08 pm)
I have a 95 S10 2wd. It has a 2.2L 4 cylinder, 5 speed manual tranny. 141000 miles. This truck has been great to me, up until the last six months. Chasing several different problems (most of which are now solved) I had to replace the spark plugs and spark plug wires, a leaking fuel injector, the water pump, the alternator, the battery, and the catalytic converter. I currently have two problems with the truck. When driving, at idle I lose oil pressure. It isn't dropping completely, but low enough to set off a warning light (in the red part of the gauge). When on the freeway, or at a stop but revving, the oil pressure looks fine, but as soon as I push in the clutch the pressure drops. This problem only occurs when the engine warms up. I have added oil to it and it does have a small leak somewhere that I've not identified, but it has had this leak since I've owned it. It's a very slow leak. Additionally, only when the truck has sat for a few days, it misfires until it reaches operating temperature. It only misfires in gear under a load. If you push in the clutch or slip it into neutral and rev it, it does not misfire. Does anyone have any insight? I mostly concerned with the oil pressure, but any info on the misfire would be greatly appreciated. Replies to this message: gonogo (Sep 28, 2009 7:41 am) dfmartin (Oct 14, 2009 9:15 am)
#32 of 33 Re: 1995 S10 2.2L [dfmartin] by gonogo Sep 28, 2009 (7:41 am)
Replying to: dfmartin (Sep 27, 2009 6:08 pm) For oil pressure try a new sender unit, if no help, may need an oil pump or engine overhaul. That engine works best with factory plugs, I know they are expensive.
#33 of 33 Re: 1995 S10 2.2L [dfmartin] by dfmartin Oct 14, 2009 (9:15 am)
Replying to: dfmartin (Sep 27, 2009 6:08 pm) I replaced the sending unit and my pressure is looking much better. Poor old girl has a quiet knock sometimes now. Looks like it's time to upgrade. Anyone want to buy a 95 S10 with 141K? Only $12,000.00 HAHA (kidding)

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