Last post on Aug 14, 2013 at 9:55 PM
You are in the Chevrolet S-10 & GMC S15 Sonoma
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Chevrolet S-10, GMC S-15, GMC Sonoma, Engine, Truck
#226 of 319 starting issues 99 s10
Feb 21, 2010 (7:50 am)
I HAVE A CHEVY S10 1999 4.3 V6 WITH STARTING ISSUES (ELECTRICAL) . IT WOULD RUN FINE THEN WHEN I WOULD LEAVE PARKED FOR MORE THAN A DAY IT WOULD CRANK BUT NOT START, I WOULD KILL THE BATTERY TRYING TO START IT . I WOULD THEN RECHARGE BATTERY AND THE DARN THING WOULD START WITH NO PROBLEM , THE PROBLEM PERSISTED I BEGAN TESTING THINGS AND REPLACING PARTS COIL,IGNITION MODULE, CAM SENSOR ,CRANK SHAFT SENSOR AND IT WORKED . 1 YEAR LATER ITS DOING IT AGAIN . I HAVE FUEL PRESSURE ,SPARK . CODE READER STATES OPEN CIRCUIT ON CAM SENSOR ,I REPLACED IT RAN GOOD FOR 2 WKS NOW IT WONT START BUT IT HAS SAME CODE FOR CAM SENSOR ,COULD DISTRIBUTOR BE CAUSE ONLY THING FACTORY LEFT ON TRUCK MOTOR WAS REPLACED 3.5 YEARS AGO (NOT MECHANICAL ISSUE )
#227 of 319 Re: 1996 Sonoma random start [spared2liv]
Feb 21, 2010 (9:30 am)
I would say electrical ignition switch, not the key one. It's located lower column.
#228 of 319 Re: starting issues 99 s10 [perez1812]
Feb 22, 2010 (11:21 am)
i had the same problem .. its a the pass alarm... sonoma's are notorious for it.. i bet your security light flashes too when it wont start.. just install a pass alarm bypass - people usually install those along with remote start
#229 of 319 Re: starting issues 99 s10 [rnorling]
Feb 26, 2010 (3:48 pm)
thanks i have noticed the security light does come on , I no there is no alarm on the vehicle so i will try this. I appreciate the help,thanks
#230 of 319 Re: 1996 Sonoma random start [gonogo]
Feb 26, 2010 (3:52 pm)
Thank you for your suggestion , I tried but could not locate any problems with this portion of the wiring harness at bottom of column.
Mar 14, 2010 (1:41 am)
Multiple cylinder misfires or runs like a dog when the throttle is mashed to the floor if all else fails check the distributor gear ((. Very easy to reinstall compared to previous models. Mark with tape or marker on were the gear came out and be gentle on re-insertion.
Spend money on good plugs cap and rotor.. Save on wires and coil.. The system is a high frequency voltage the spark passes through thiner wire easier.. wires dont make a much differance unless damaged.. Mist with water and check for a light show.. Coil doesnt always show as the backside is the fastest point to ground. on most 94-02 s-10s
Wont start when wet... This is a *%*($( Many things can go wrong here. I start with checking the coil first by making the coil ark BLUE at least an inch or so than the coil wire to the distr - #1 on dist to ground-- Most of the time the coil weakens from a hidden crack on the backside. Remove to observe to see ground traces. Corrosion is another factor in the diss cap also the pickup coil and senor. The moisture gets traped easily in the cap and causes problems with all components underneath, Always use high quility electical components not the ones found at auto zone and such stores. The temp sensor and crank sensor also can have an impact on this also telling the engine it is to cool or to warm crank sensor can be cleaned and usualy never is the problem. Have auto zone check all that they can at once. Using an ohm meter and the manual you can check most all sensors on or off the car. Usualy no Codes it isnt a sensor . ELECT or GAS or DISASTER
I good way to test the MAF is to unplug it and see if it runs better or same. Unplugging bypasses and tells the engine that the air is 72 and 50% humidity Never spray anything on the maf excect when cleaning. Use paper towl or shop towel and pure alcohal and water filtered compressed air.
When a code tells you that your MAF is bad it could be the o2's. Always change all the o2's together if one goes bad it caused the others to buildup and makes them slower to respond even thow there is no code. Helps having a tech-2 or a good reader. Also studied new ones compared to ones that were old.. gas+better idle and quicker response when punched
for the carbon and to clean the motor and to get back the gas mileage and a tseafoam through the intake oil and gas When through the intake small amounts at a high idle using 93 octane gas.
Fuel pump failure- Leave the tank full as much as possible- 13 mpg I know its tough. Helps with cooling / easier to draw gas with internal pressure and keeps the water down.
Napa sells a good pump as well as the one from delphi. As good or better than delphi
Airtek and master pumps are only rated for 50 psi initialy and are increased with a capacitor and not copper to cool..Napa Ac delco and delphi pumps I personaly compared to the airtek and master pumps CHEAP !!!! Carter pumps I have never used or examined. Runs best purged at 60+ psi anything lower can cause problems.. Gas cap lowers pressure in some cases and also causes the pump to run harder/hotter
The wires that lead from the pump I have seen them melted along with the top of the pump. Replace with a ground strap and the connector usind the strap alond side. Fuel filters are used up quickly cause the flow of gas is at more pressure theremore causing larger particals to break down and clog the filter quickly. dry gas and additives also clog the filter and are hard on the pump when not used by the bottles instructions.
#232 of 319 Re: 85 S10 wont start [adrian10]
Mar 14, 2010 (4:58 am)
did you get truck to start
#233 of 319 S-10 with fuel problem
Mar 15, 2010 (11:12 am)
I have a 94 S-10, 4.3 throttle body injection that starts and runs then dies and is no longer pumping fuel through injector, I can leave it sit for a while and it will start and run for another few minutes. I have replaced fuel pump,filter,lines,injectors and fuel regulator with no change it still is doing the same thing, its got me stumped, any ideas.
Any info would greatly appreciated.
#234 of 319 Re: S-10 with fuel problem [shawng05]
Mar 15, 2010 (12:49 pm)
My problem resulted from trying to run synthetic oil too long, which resulted in the 'blinding' of one or more sensors. A thorough cleaning of the inside of the engine, including a couple of short oil and filter changes, solved all the problems without replacing any parts. I think I tried using commercial cleansing additives to each oil change until it seemed clean. Part B of that is, if this doesn't work, I'll wager you have computer problems. Worth it to check cleaning procedure first.
#235 of 319 1995 GMC Sonoma
Jun 28, 2010 (2:04 pm)
I Just replaced the battery in my 1995 GMC Sonoma and now it wont turn over but the alarm is going off, I have no way to turn it off, any suggestions?