1999 GMC Sonoma Consumer Discussions

Electrical or ignition Problem

• Re: 1999 GMC Sonoma 4.3 Vortec [rnadeau5412]

  Written by: brian1971mopar on Oct 30, 2011 8:09:14 PM

  After filling the trans fluid its running great. Im really happy with her now. hope you find that the fluid is low and filling it fixes your issue

• Re: 1999 GMC Sonoma 4.3 Vortec [brian1971mopar]

  Written by: rnadeau5412 on Oct 30, 2011 7:44:05 PM

  Hey so i just recently bought a 2001 GMC Sonoma ZR2 and it is also having the same issued as what your talking about, when under a small highway load or low RPM s it tends to jump back and forth. Just wondering if topping off your fluid for your transmission did the trick, or if your problem came back again? Just wanted to know if it was worth the effort ... Read More

• Re: 1999 GMC Sonoma 4.3 Vortec [equatortr]

  Written by: brian1971mopar on Oct 20, 2011 7:34:38 AM

  Hi, after all the time and money me looking like an idiot it turned out to be 3 quarts low on trans fluid. i look bad yes but the mechanic looks worse. He never test drove the truck. hope this helps

• Re: 1999 GMC Sonoma 4.3 Vortec [brian1971mopar]

  Written by: equatortr on Oct 19, 2011 10:23:26 PM

  Brian & Forum, Seeing as you posted over a month ago, you ever get to the bottom of this issue? My 2000 S-10 ZR2 (similar set-up) is doing the exact same RPM hunting (occurs under light loads, esp. around 45mph, and most often when not fully warmed up). This started about the time my transmission started slipping a little on take-off (I now get a check engine light with the code ... Read More

• 1999 GMC Sonoma 4.3 Vortec

  Written by: brian1971mopar on Sep 12, 2011 7:10:34 PM

  I have had this RPM problem for some time now. The RPM's jump. Most noticeable at slow acceleration and steady speeds below 65mph. The rpm's jump about 300 to 500 rpms but drop immediately. A mechanic said the ignition coil and coil wire. I tried a new coil and new wires and no luck. A month goes by and the truck shut down. Wouldnt start. Towed it in and the same ... Read More

Chevy S10 - GMC S15 and Sonoma Fuel Pump and Fuel System

• Something's Wrong!

  Written by: danndann09 on Jun 8, 2010 3:46:24 PM

  okay guys. my boyfriend owns a 1999 GMC Sonoma and he just recently started having problems out of it. He took his dad to work one day and while waiting he turned the truck off, five minutes later he tries to start it back and it won't do anything. Well, he's changed the fuel pump, checked the wires and many more things but it still will not work. Does anyone know ... Read More

1999 GMC IS ELECTRICALLY DEAD

• 1999 GMC IS ELECTRICALLY DEAD

  Written by: eda0407 on Jan 10, 2010 7:23:12 PM

  I OWN A 1999 GMC SONOMA THAT HAS REGULARLY DIED ON ME DUE TO TWO BAD COILS, A BAD ALTERNATOR AND OTHER THINGS THAT I CANNOT REMMEMBER. I HAVE PAID COUNTLESS MECHANICS AND NOTHING SEEMS TO SOLVE THE PROBLEM FOR VERY LONG. IT DIED THE FIRST TIME WHILE I WAS DRIVING 75 ON AN INTERSTATE AND THEN THE MOST RECENT I TURNED IT OFF AND TRIED TO DRIVE IT TWO DAYS ... Read More

Chevy S10 - GMC S15 and Sonoma Owners: Meet the Members

• 1999 GMC SONOMA

  Written by: bigbill55 on Aug 27, 2009 7:59:52 PM

  REPLACED OIL SENDING UNIT WITH GAUGE READS 55-60 LBS PRESSURE WORK FINE, NOW I HAVE REPLACED WITH NEW SENDING UNIT AND IT ALSO READS AROUND 60 LBS EVERYTHINGS GOOD,

• 1999 GMC Sonoma

  Written by: bigbill55 on Aug 15, 2009 7:04:21 PM

  Just rebuilt 2.2.ltr. sonoma engine runs fine but don't show oil pressure right it shows 80 plus when running and about 40 when its off, never owned sonoma before and this one was messed up when I bought it so don't know what to try.

Chevy S10 - GMC S15 and Sonoma Care & Maintenance

• Re: s10 ABS [bigrooky14]

  Written by: canufixit on Jan 11, 2007 7:04:35 AM

  Hi - try this ... Or search on the net for somehting similar. If the Sensors get dirty - or if the got moved during the Ball joint change - it will trigger the ABS ... this is part of a service notification - it may not be exactly what you have - but you can get the drift of the issue ... ============== Brakes - Low Speed (Below 5 MPH) ... Read More

Chevy S10 - GMC S15 and Sonoma Engine and Underhood Problems

• Re: 1999 S-10 4 cylinder surge and hasitiation [mickeymouse2]

  Written by: sonoma4x4 on Aug 21, 2008 11:02:02 AM

  I have a 2002 GMC Sonoma 4X4 crew cab and get the same code (0300) when I drive at 60 on the highway. I have no hesitation at any speed and the truck runs great. Do you think the crank sensor could be the problem? I have replaced the plugs, wires, rotor. cap, distributor, fuel filter, pvc.

Chevy S10 - GMC S15 and Sonoma Starting problems

• 1999 Sonoma Random Starting Problems

  Written by: timothys1 on Jul 23, 2008 5:01:45 AM

  Situation, while driving the security light will come on, the fuel gauge will move to empty and the battery light will come on. This occurs randomly. after a while the gas gauge and battery light will go back to normal, but the security light will stay on for a while then go off. Also it will not start all the time, gmc nor mechanic cannot determine why. Last check there where ... Read More

Chevy S10 - GMC S15 and Sonoma Engine and Underhood Problems

• Re: 1999 S-10 4 cylinder surge and hasitiation [flashman3000]

  Written by: mickeymouse2 on Jan 13, 2008 7:52:49 AM

  99 GMC Sonoma 4.3L V-6 Obviously your PCM is detecting misfires but cannot isolate a perticular problem. On your model it is usally a dirty or bad connection at the crank sensor, or an intermittant problem with fuel pressure. Here is an explanation. The PCM interprets irractic changes in the pulses coming from the crank sensor as misfires. Basically, your vehicle skips a beat due to any number of reasons and ... Read More

• Re: 1999 S-10 4 cylinder surge and hasitiation [dentrek]

  Written by: flashman3000 on Jan 13, 2008 6:41:22 AM

  I just bought a 99 GMC Sonoma 4.3L V-6. Experienced check light coming on/off over several weeks,hesitation during start up and while driving and fuel mileage is in the toilet (15-16mpg on average). Code came up P0300 "random multiple missfire". I changed plugs, wires, cap, rotor, fuel filter and dumped several cans of chemtool injector cleaner over 3-4 tanks. Dealer finds no problems and code light is off now, hesitation at ... Read More

Chevy S10 - GMC S15 and Sonoma Engine Swap

• GMC Engine

  Written by: dave162 on Oct 8, 2007 7:32:09 PM

  Just got a 1999 Sonoma extended cab 2.2L 4cyl. It seems as though this engine is not strong enough for this truck. I had a 96 2.2 standard trans. and it will easily out preform this newer truck which is automatic. Anyone know if I can replace this engine with a V6? Will it match up with the trans. in the truck. How much should it cost? Any help?

Chevy S10 - GMC S15 and Sonoma Engine and Underhood Problems

• GMC Sonoma with Vortek 4600

  Written by: stevenf20 on Jul 26, 2006 8:29:59 PM

  I recently purchased a 1999 GMC with the Vortek 4600, heaby duty suspension and locking rear axle. The truck is rated for 16-21 MPG, but I am only getting 13.5 and I do not do city driving. Is something wrong??

Chevy S10/GMC S15-Sonoma: Problems & Solutions

• Re: 1999 S10 problems after some time of running ... [canufixit]

  Written by: joe3891 on Sep 7, 2005 9:42:53 AM

  This letter is intended to make you aware that some 1998 and 1999 model year GMC Sonoma truck, equipped with a 2.2L 4-cylinder engine, may experience illumination of the "Service Engine Soon" (SES) light, engine misfire, rough idle and hesitation. These conditions may be due to spark plug wire failure. The cause of this condition may be improperly seated and loose spark plug wire terminals. Action: To address the above mentioned ... Read More

• Re: Need help code P0410 [tlseipel]

  Written by: alcan on Aug 15, 2005 4:58:25 AM

  Here's the TSB relating to your P0410 trouble code: 2001 Chevy Truck S10/T10 P/U 4WD V6-4.3L VIN W Emissions - MIL Lamp ON/DTC P0410 Set Bulletin No.: 04-06-04-015 Date: March 22, 2004 TECHNICAL Subject: Check Engine Light On, DTC P0410 Set (Replace AIR Pump, Install New Hose Assembly) Models: 1999-2003 Chevrolet Blazer, S10 1999-2001 GMC Jimmy 1999-2003 GMC Sonoma 1999-2001 Oldsmobile Bravada with 2.2L or 4.3L Engine (VINs 4, H, 5, ... Read More