Last post on Sep 06, 2013 at 7:28 AM
You are in the Chevrolet S-10 & GMC S15 Sonoma
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GMC S-15, GMC Sonoma, Chevrolet S-10, Truck
Dec 18, 2006 (8:54 am)
Hi, Does anyone here know if I can put an older 4.3 in my 91 GMC Sonoma. I need to replace my motor. I found a 4.3 L out of an 85 that has been rebuilt, just not sure if it will work.
It seems like any 4.3 L should work, if I just used the long block. With my intake and throttle body.
I'm new to this truck so not sure what will work.
Any help will be appreciated.
#28 of 427 Re: 97 Sonoma Fuel Pump Problems? [34theshow]
Dec 28, 2006 (11:43 am)
I am having the same issue. I thought the fuel pump was going bad. Sometimes it would pump and sometimes not, so I replaced the pump, sending unit, and filter. It started up immediately after replacing the parts, but died about 5 miles later. Now it runs for a minute or two, then dies, and will start again if I let it sit (15-30mins). My only idea, is that maybe its not getting a signal from the ECM or maybe a bad relay. Any ideas?
#29 of 427 Random cylinder misfire'98 4.3L
Jan 19, 2007 (11:47 pm)
#30 of 427 Random cylinder misfire'98 4.3L
Jan 19, 2007 (11:47 pm)
I know I'm not the only one with this problem, but still haven't seen a definite solution to this problem in this forum yet! Here's my story: Truck was running great, then it suddenly died. Motor would crank over, but not fire up. Had towed to shop, hooked up to computer and told crank sensor was bad. Changed crank sensor and truck fired up with a bad miss on all cylinders. Checked computer again and said IAC was bad. Replaced that, no difference. Then proceeded to change cap, rotor, plugs, coil, ignition module, cam sensor, cleaned,but not replaced, EGR valve(VERY little carbon build-up plus no trouble code for it). Gave up and took to dealer who said injector's might be clogged and ran a cleaner through it that uses nitrogen to "pop" them clear. NO change. They said #2 and #4 were open, but all others were clogged. Said it be $1,000 to replace injectors. Took truck home and found a place that sent me a complete reconditioned assembly w/new pressure regulator for $219. Then put that one in and still no change. Took back to shop and checked fuel pressure, it was on low end of specs so I replaced that and still no difference. Oxygen sensors appear to work correctly as they are changing readings constantly. I'm at my wits end and do not wish to give up on it as the truck is in excellent shape w/240,000 miles(but only 40,000 on new GM long block that I had installed 2 years ago). Now keep in mind, after I changed the Crank sensor and IAC motor, the only code that shows up is random/multiple cylinder misfire. Anyone Have another idea?
#31 of 427 Re: 4.3L Motor swap [texashippie]
Jan 20, 2007 (8:17 pm)
Back in 1999 I bought an 86 Lebaron convertible with the Chrysler 2.2 engine. The owner that I bought the car from replaced the engine with a 2.2 out of an 88 Dodge Shadow. He said the most important thing is to make sure the engine bolt patterns match. Although it's the same 4.3 engine, the bolt patterns may differ between an 85 and a 91. Good luck.
#32 of 427 S-10 wont start
Jan 23, 2007 (6:30 pm)
I have a 92 S-10 with a 2.8 in it.saturday i pulled it in the garage for a basic tune-up and oil change. changed the oil,distributor cap,rotor,spark plugs,spark plug wires,air filter,fuel filter. went to start it up nothing happened rolled over like crazy but never fired.sunday re-installed all the old stuff that it started with when i pulled it in and nothing, rolls over no fire. so i replaced the coil and now only get yellow spark,any ideas i'm about out of them and the wife wants her car back.
#33 of 427 Re: S-10 wont start [jbikulcius]
Jan 25, 2007 (10:57 am)
had the same problem once with a 350 (similar engine). we finally had to pull distributor and replace pick-up coil.
#34 of 427 Re: Random cylinder misfire'98 4.3L [5speedfiend]
Jan 27, 2007 (10:17 am)
**Update** I haven't totally fixed problem yet but I started checking for wiring problems. Found that both battery cables were severly corroded inside their plastic housings. So I've replaced the cables and the motor is now running much stronger but still has the misfire. Now a new code has come up, crank sensor intermittant.
#35 of 427 Re: S-10 wont start [jbikulcius]
Feb 02, 2007 (6:52 pm)
I had the exact same problem with my 91 sonoma, 4cyl - 2.5. I had just tuned it and everything.
It ended up being a distributor problem - which became a bigger problem with the limited production run of these engines.
I ended up installing a Multiple Spark Discharge - distributorless spark delivery system.
Now the truck runs like a dream...a little 4 banger pounding along like a v6 - I recommend the MSD for ANYONE with spark issues in the the older s series trucks.
#36 of 427 Re: Random cylinder misfire'98 4.3L [5speedfiend]
Feb 10, 2007 (7:55 am)
*** Final update *** The problem is now solved. It appears that the crank positon sensor that was replaced directly after problem arose was either the wrong one or was bad. Replaced sensor with new one and truck runs perfectly. This was rather annoying as the no codes alluding to this were seen until EVERY sensor on top of engine was replaced.