It was only used from 2016-2018 in select Silverado’s and Sierra’s. 1994 S-10 4x4 pickup, 4.3L, VIN W. 215,000 on the truck, 40 or so on a GM crate engine. Anyone else have it where it feels like the car has what seems like a stumble/misfire/vibration at low speed/takeoff under load? Misfire is present, but no misfire codes are registered in the computer's memory. After changing the plugs and wires, you now need to do an ignition test. 2013 Cruze LTZ 1.4 T (USA) 114,000 miles did the valve cover replacement this past summer, put new plugs in then developed stutter and p301 code 2 months ago, put in a new coil pack, code gone. what is funny is I had a car recently with a miss only under load. An engine that hesitates, stumbles or misfires when accelerating or when it is under load, is an engine that is either sucking too much air, not getting enough fuel, or misfiring. No check engine light. This is because of the higher demand for spark. Chevrolet S10 Internal Faults in Distributor Can Cause Engine Problems - 205 reports. (Odometer reads ERROR) I have had the pickup for 6 months now. Jump to Latest Follow 41 - 60 of 110 Posts. This concern (misfires) usually occurs with extended idling and may be reduced/eliminated by raising the RPM slightly or inducing an engine load (such as A/C). I replaced the entire ignition system. 2016 Ram 2500 Mega Cab Cummins Plugs, wires, dist., coil, etc. While driving up hills or increasing load, the CEL will flash multiple times, I pull over as I know CEL flashing is not good. Misfire Easy step by step guide on how to troubleshoot and repair an automotive engine cylinder misfire P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and P0308, though ... 97 Chevy Silverado, Running On 7 Cylinders yesterday i took it to lunch took it back to work and all was good. I know it does this because it sends a P0303 code. went to leave work 4hours later and instantly noticed a misfire under load above 1500 rpm. Vehicle: 2002 Chevy Silverado 1500, 4.8 V8, 5spd manual. ... (Cyl 3 misfire) - P0420/P0430 (Catalyst efficiency below threshold, both bank 1 and bank 2) ... the problem is that it happens only when under load, when revving in park, the truck acts fine. stumble/misfire under load? Remember, a vehicle needs air, fuel, and spark to run. If the misfire is still present, the ECM will disable the fuel injector again repeating the process. Hello again, I'm having some problems getting the Chevy 350 I dropped into my S10 Blazer to run right. As soon as I bought it, I felt a slight cutting out and I installed new platinum (oem) spark plugs and quality spark plug wires. It depends on how serious the misfire is. For a cylinder misfire problem, you need to change components, such as coils, spark plugs, etc. In the process of ‘spinning this yarn’, you'll see what the overall diagnostic strategy was and what testing techniques I used to get to the bottom of the issue causing the misfire/rough idle condition (on my neighbor's 1995 Chevy Blazer with a Vortec 4.3L). P0300 Trouble Code Diagnosis- Chevy S10. 45 to 60 mph Engine will start getting to wear it is working, starts to sound "different" and run a bit rougher, then it will buck or hesitate. Maintenance/Repairs. Typically an engine misfire under load, will be a problem with the ignition system, while low engine speed problems will be a vacuum, fuel management or compression issue. When retrieving trouble codes, only consider related codes to a specific misfire problem, like an ignition coil failure code. Vehicle Data 1996 Chevrolet S10 LS. Here are some of the most common symptoms of a misfire condition on your GM 2.2L: The check engine light (CEL) will be on. Vehicle Data 1996 Chevrolet S10 LS. My big block 70 Chevelle was real bad at doing that. So far Ive replaced; plugs, wires, cap n rotor, coil, egr valve, fuel filter, o2 sensors. 5 speeed manual trans. Back to answering the question “Can a clogged catalytic converter cause a misfire” well yes is the answer, but is not always the factors of the case that could cause a misfire. higher the rpm and the more throttle into it the harsher the misfire. Turned out to be the injector harness had a pinch but only pinched under load when the engine moved. The check engine light usually only flashes though (for a misfire), and goes away after about 20 seconds. This means you need to remember the engine load, throttle position, RPM and of course, road speed. Chevrolet S10 Engine Misfire or … The vehicle may produce excess vibration, espescially at lower RPM . Fuel issues are one of the most common reasons that a vehicle would stall out, that includes your Chevy S10. VIN ... Cuts Out, Misfire: Occurs: Always, Hot, Under Load, on Accel: Misc. In Spark Ignition Direct Injection (SIDI) system applications, if a fuel injector fault DTC is set during a misfire event, the ECM will not re-enable the injector. VIN: 1GCCS1943T : Engine: When the catalytic converter is clogged causes the car to lose power. Park the truck in a really dark location and with the hood open and engine idling (parking brake on), have a friend punch the accelerator pedal quickly while you lean over the driver's side fender and look for any ignition sparks jumping off the plug wires directly to the engine and ground. When diagnosing a misfire DTC and no concern can be found following eSI, the technician should inspect for aftermarket components installed. Random misfire in 2000 4.3 vortec changed plugs, wires cap, rotor, checked ign module - Answered by a verified Chevy Mechanic ... 1999 chevy astro van 4.3 v6 vortec mil code p0305 misfire cylinder number 5,hesitates up hill under load? Related Documents & Media 1996 Chevrolet S10 LS Related Documents & Media 1996 Chevrolet S10 LS Message Closed w/FIX. A week or 2 ago the truck started missing and surging anywhere but idle or wot. (Tach doesn't work so RPM numbers are a guess.) It will not always buck or hesitate once it runs rougher, but it will ONLY do it after the load, sound, and running rougher have started. Replaced tps due to code p0122. The cutting out (random misfire) continued, but just every now and then. to isolate the root cause of the misfire. A/C: Message Closed w/FIX. My 2002 Chevy S10 Blazer recently started misfiring on Cylinder 3, however it only does this when driving over about 50MPH up a steep hill (so under heavy load). With the engine on, listen for a high-pitched hiss. So i have a chevy 350 i rebuilt recently and have put about 50 miles on it and it ran great. Usually when its under load like that its ignition related.Inspect the ignition again, with the engine running spray water from a spray bottle on the distributor cap wires and spark plug area, if the insulation of the ignition system is good the engine note should not change. 2014-2019 Chevy Silverado and GMC Sierra 2014-Present Chevy Tahoe and GMC Yukon 2014-Present Chevy Suburban and GMC Yukon XL. Come join the discussion about performance, modifications, troubleshooting, maintenance, and more! One or more misfire codes (P0300, P0301, P0302, P0303, P0304) will be stored in the car or pick up's computer's memory. L8B EcoTec 5.3L. It needs them in the right quantities and intervals, or it won’t run right. That's a sign, but you likely won't be able to pinpoint the leak without some help. 106,000 miles, I've owned it since brand new. Duray90. 2003 S10, 4.3 and she drops a random cylinder when under load whether it's with a trailer in tow or just going up a hill. It idles nice and smooth, and has good low-end tire-spinning power. I have a stumbling/misfire issue at low rpm under medium to heavy throttle. Chevy S10 Stalling Problem Causes. This one is staying over the weekend, and maybe I can get a few fresh ideas Monday morning from all you super techs. This rich mixture will load up your spark plugs real fast so if you floor it and accelerate hard then the motor will start misfiring and popping. 2004 GMC Sierra 2500 HD, 227,000 miles 6.0L V8. An ignition misfire can be consistent (all of the time) or it can come and go (intermittently misfire). All in which came back ok/no codes. Can you tell which cylinDer is missing? If parts weren't so cheap, I'd drive this thing over a cliff. P0300 Random misfire while under load. If the plugs are old it will also misfire when floored. Learn about this problem, why it occurs, and how to fix it. If the misfire is not present, the fuel injector will remain enabled by the ECM. If the Check Engine Light comes on, you may find any of the following codes: P0171, P0174 Lean fuel condition codes; P0120 to P0124 Throttle position sensor codes Putting it in gear Increases the load. Before swapping those out, check under the hood for a vacuum leak that could cause a misfire. With the engine on, listen for a high-pitched hiss. I got a 99 tahoe 5.7 vortec with multiple misfires under load/accelerating. Misfire/Loss of Power on 2001 Z71. Here are some of the issues that cause the S10 to stall out. Jump to Latest Follow 1 - 15 of 15 Posts ... you might want to look under the distributor.. you may find 2 oil pressure switches/senders.. there will be a single wire version for the gauge.. there may be a 2 wire version.. when the oil pressure comes up. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. Fuel. I need help figuring out a misfire problem on a 1998 chevy s10 blazer with a 4.3 vortec - Answered by a verified Chevy Mechanic We use cookies to give you the best possible experience on our website. 99 chevy silverado 2500 4x4 Has a 6.0 L with bad misfire under a load and is not setting a code. Hello everyone. The whole car shakes when it does it but doesnt do it all the time. Prev ... again this is a stumble under load...I would think if CATS were plugged up code would set ... A forum community dedicated to Chevy Impala SS owners and enthusiasts. So here is a clogged catalytic converter can cause a misfire. 2000 chevy S10 2wd pickup truck. I have found that an ignition misfire will usually happen more under a load than at idle. drove it home about 15 miles spitting and sputtering up every hill. sometimes it would show number 1 misfire in the data part of the scan tool, still not setting a code even after more than 2 different cold to warm trips. Chevy Truck Forum | Silverado Sierra GMC Truck Forums. The vehicle itself may begin to run rough. Misfire/Loss of Power on 2001 Z71. Basically - part throttle, light load, slight grade or hill. Also, make sure you jot down the other codes, as misfire can be caused by a malfunctioning component or system. The L8B engine variation was a semi-hybrid engine variation that featured a lithium ion battery pack for fuel efficiency. July 18, 2016, 4:42pm #1. Chevy 350 Misfire. It is all stock with approximately 118,000 miles on it. It runs great with the new wires and stuff, but still chugs and sputters when I accelerate or under load! What only missing in gear tells me is a light misfire where you don’t feel it when the load is light. The P0300 Chevy trouble code will trigger the S10’s service engine soon light. San tool is showing up to 175 misfires per cycle. Check Engine Light flashing shows a serious misfire is happening in number 6 under load. Tested; vacuum, fuel pressure, OBD 2 scan.