94 chevy tbi running rich Chevy C/K Truck Forum 95 K1500 350 constant stalls It is running really rich and the injectors are spraying a lot of fuel. How does fuel drain back, only 350 tbi running rich. Consult a service manual or see below for any check engine light code definitions. Okay I have had some positive results I have a 1994 s10 that is getting really bad gas mileage and running rich. 0L/4L80E RC/LB with "Chevy conversion". But it makes me wonder. Bought the truck last spring. So rich that you smell like gas after you drive it! It doesn't miss and Idles really well for how much fuel its IF you are running rich: Either your injectors are stuck open (usually an ECM fault), the fuel pressure is too high, or the ECM is getting incorrect signals from one of the sensors. dexcoolius; Mar 25, 2025; Engine Performance + My 94 Chevy 1500 Rpms fluctuate up and down at idle and I am starting to notice it while going down the road. youtube. Also new Coolant 1988 rich on cold start The 1988 - 1998 GMT400 Chevy & GMC Pickups Message Board (350 motor/TBI) runs rich on cold starts. Truck has low original miles on it. If it is running rich, you may have an Hello, I am having a strange issue with my 1994 Chevy Silverado. If it is running rich, you may have an My 94 had the exact same issues, and it drove me nuts. com/watch?v=XhIECVL-WUs I have a 1988 Chevrolet V30, 7. It wont hardly run. User Info. Post: 1994 5. Jump to Latest '93 Chevy Running with stock programming with a low idle speed setting combined with the fact the chip is designed for 20-21″ of vacuum at that idle rpm with a cam upgrade which typically drops the Re: 95 Chevy S-10 4. 7:1 at 94° C (201° F) running temperature. Had motor professionally rebuilt and have been chasing electrical gremlins ever since. Truck ran fine before rebuild, aside from at end of life due to age. Every cold start until the engine warms up it runs not good at all. Number 5 So my tbi 350 was running a bit lean and has been having a little missfire here and there so I decided to try the vortec pump and it ran rich with the vortec pump which makes me Chevy Forums FREE technical assistance for your restoration and repair. You can smell gas, under load you get I just got a new exhaust installed today. 3 TBI VIN Z that runs way too rich. 4, 400 transmission. The engine seems to be So I am running into TBI code 33. It's a 350 TBI that That is, at idle, I was running rich due to low fuel pressure due to dropping into open loop and ECU saving idle with dumping fuel. When it runs like crap, the ECM regulates the mixture Disconnect if the problems still there than look for another problem. Also when in gear when you let off the throttle it stays reved up for a extra second or two. What is happening is the fuel is draining from the line back into the tank and the short run cycle of the pump during starting is not sufficient to pressurize the line to a running I have a rcsb 93 z71 with the tbi 350. There is often a backfire or two when this happens. I had an extra new one in the shop swapped the sensor and still had the code so I look up the Flow chart. Thread starter GrizzlyFabworks; Start date Jul 28, 2021; Tags engine idle management problem rough runs tbi G. Next Last. 2005 2500HD CC/SB Cadillac Blue LS 4wd LLY/Ally, the new 2. I don't know where to look next. 1 of 2 Go to page. Anytime you've been driving and get out of the pickup, you can smell that it runs rich. I have replaced the m. Not all 93 4. However, it was my experience with my 2007 GMC Sierra 1500 SLE. What are the usual symptoms or running rich? 2001 GMC2500HD 4x4 CC 8. Chevy C/K Truck Forum. bbc , 79 dana hp 60 chevy outers, 14bolt ff spooled divorced 205 and cut 40'' Howdy - My father in law's '91 Chevy was running poorly, so we put new plugs, wires, cap and rotor on it, and it's running better, but it it still surging at idle. Hello, I have a 1988 Chevy S10 so this is after a short trip to parts store, Uneven oil pressure, seems to be a strong 40psi when first started and as it warms up it bogs down to 20-30ish I have a 1994 Chevy Silverado K1500 V85. New comments cannot be posted and votes cannot be cast. 3 that runs very rough and does not idle properly, New spark plugs, new distributor, I have a 6/94 s-10 with 4. Thanks for the reply. You can take the same route over and over and it does NOT do it all the time. The TBI I thought odbII came out in early to mid 90's. When in park and you press the gas the engine revs up nice but Under the engine section you'll see "running rich" - there's info in there about testing the coolant temperature sensor. Connect the scanner to the ALDL and check the engine RPM. One out of five times the idle will seem to fall out when taking it out of gear and coming to a stop. Start it cold, wait 15 seconds of so and it goes rich and starts bogging down and sputtering. The Chevy 350 TBI engine is a popular choice among car enthusiasts and mechanics due to its reliability and performance. I did a rebuild of motor, cleaned gas tank, new pump and sending unit and new filter. Jump to Latest Ever since then it surges really bad at idle, was backfiring through the tbi (running lean condition or timing), and would barely run. 1993 K1500 running rich Does anyone know about 350 TBI engines? I have a 1987 V10 with the original 350 TBI. 3 tbi. It basically almost Chevy Forums FREE technical assistance for your restoration and repair. But in this case the check engine light Sometimes you can let up of the gas pedal and then hit it again and it clears right up and runs fine. Is that 800 RPM, in park, or in drive? The 1994 and newer big 08-12-11 11:45 PM - Post# 2125062 In response to navygunner08 Ok guys im going through the same problem with my moms 99 escalade (same engine as the silverado) also checked for all 1989 Chevy K1500 5. It seems to be running rich (the strong odor of gas in the exhaust). 3L, TBI. MAP Sensor Voltage Too High. Post: 1990 350 tbi running SUPER I have a 91 S10 Blazer 2WD that is running super rich, strong smell from tailpipe, bad mpg. NO codes or SES. This gives Hello. I have a 1990 350 tbi that runs great cold. Map sensor hose. 5 Turbo Diesel. That is the Fix it here. 1 cylinder. 3 TBI Running Rich? 94 GMC Noma 4. Finally, when it dieseled, it threw a CTS code stating that a temp Hi everyone I have a 94 k1500 with a 5. After pulling carb I found the primary butterfly open so far that the transition Chevy 350 TBI Engine Specs. the intake and up, I rebuilt everything however I didn't like how the injectors went Chevy Forums FREE technical assistance for your restoration and repair. p. 7l engine. Its the only part I havent changed out. 1990 350 tbi Vacuum Leak, Running Rich, Code 45, TBI 454 FIXED Thread starter MTBLAZER89; Start date Jul 31, 2008; 1; 2; Next. MPG's are not affected. Chevy Suburban Forum (GMC Yukon XL) '93 Suburban running rich upon startup. 7L 350TBI erratic idle and stalling at low RPMs I keep thinking that I should rebuild a 25 year old TBI 1994 1500 5. Hold the throttle down for 30 seconds then it gets past that issue TBI Chevy running rich. I rebuilt the TBI and replaced all Cliff-notes below. 91 S10 Blazer - 4. 7 TBI. the Block learn will be too rich again. Go. I've verified all of the normal things that may cause such as the map sensor, 1994 K2500 Cheyenne 5. I ran compression tests and all cylinders except #5 read around 105 - 110. 7 tbi skip, stall, sputter, trouble starting etc. 7 TBI, runs rough and very rich when cold but then runs fine after warm up and several restarts later. Before I went on a Now when its cold it runs in this thread in this sub-forum in the entire site. I like it very much. 7 TBI- Sudden Loss I have a 92 tbi 350 that runs rich. 7 TBI running after 10 years of sitting inside. m. The truck runs well above idle, never stalls at idle but idles rough. 1L 496ci Vortec :head2: Allison 5spd. Jump to Latest Tbi has been rebuilt, injectors as If it is unable of running below 800 RPM test the fuel pressure, especially if the idle sounds weak and unstable. This is brief summary of longer saga. When I press down on the gas with a gentle tap, the truck sounds like it has a misfire or as if my fuel Vehicle is a 1992 K3500 Dually 7. 0. It is SBC 350 with TBI. 9 volts is a rich exhaust reading, usually caused by a vacuum leak. '89 Astro, 4. Richard . Welcome to ChevyTalk. new o2 sensor! https://www. Jumpered the ALDL, got a code 33. 7 (I did the swap, have had the truck since 1998, 323K on the original 4. need to give it a little throttle to get it running. truck's running fine again but I stop by O'Reillys and rent a fuel pressure gauge. You may get some good answers here, for there are a few 1994 K1500 350 New Distributer, rebuilt throttle body, new IAC new injectors, timing setPROPERLY. I basically have to crawl Chevy TBI 454 surging idle. I’ve verified all sensors and wiring. I tried something earlier with the truck running actually truck running I actuated the throttle on the side of the throttle body body and 1991 K5 TBI 350 with SM465. Pumping the gas does not help. They have two sensors: One for the gauge located in the intake, and one for the ECM located in the head behind No. New PCV , good cap/rotor/wires/plugs, 6500 miles on new engine( Flat tops First I start with a new Fuel pump, STOCK 75lph TBI fuel pump will only support about 230hp before the fuel pressure drops like a rock. 3L CPI - SOLD! '99 S10 ZR2, 4L60E, 4. I recommend upgrading to the 1996 Vortec 155lph Or is it because its already running rich and when the o2 sees that its, unable to compensate because of another problem? 1995 C1500 4. It starts and dies, and it smells really rich. tbi, on a 350. I knew I'd forget something My '94 that I bought last week runs great, but I've noticed it runs a little rich. now we know you have a TBI system. 7 TBI 700r4 Trans 1991 Chevy C1500 Silverado 5. I’m having an issue where my TBI 350 is running rich when cold and if you rev it a little it will spray a ton of fuel out of the injectors accompanied by black smoke. 7 TBI 1995 Chevy Truck Tech Forums. 3L 2WD 5Spd. 4L TBI 4l80E 4X4. It sounds good, but my mechanic told me that its running rich and i should bring it in so they can see why. 3 Running Super Rich (Topic#152542) Cameo deuce Member Posts: 111 Loc: ABQ---NM Reg: 07-23-06. Here is an update. TBI 350 running rich The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board Register or Log In To '84 chevy half ton short box 2wd, 67,000 actual miles 02-12-11 03:54 AM - Post# 2045542 Truck has 253k miles. It was running rich before the rebuild and is still running rich. 3 TBI runs rich winaldl data But it doesn't make sense that the O2 sensor then just sit on the rich side and the ECM don't try to compensate it. 7/MG5 Originally a 4. Send Private Topic Your TBI is surging with steady part throttle in open loop when cold. 3 now a 5. 5 running rich it had a bad fuel pressure regulator! Things to check are injector o rings . Advanced Search My 94 s10 pickup with a Chevy Truck Tech Forums. 3L TBI - Idle troubles Hello MT, The truck has electronic ERG. It started when I fired it up one morning and it didn't wanna high idle. My truck is running rich. Most the time when I fire it Chevy Forums FREE technical assistance for your restoration and repair. Before it Ok I am really frustrated with this one. It does have allot of miles on it (275,000) but for the most part it runs like a clock. 3L TBI Rough Idle (Running Very rich?) troubleshooting Archived post. Chevy C/K Truck Forum 1995 C1500 5. I think the engine was replaced at some point since compression on all cylinders is I just got a 1990 5. I was getting around 300 miles on a fill up and averaging 17-19 mpg with mostly highway but some Chevy Forums FREE technical assistance for your restoration and repair. 7L truck. I have a high idle problem. It would stall while sitting at idle in park or when in gear at a stop TBI Running rich Jump to Latest 17K views 28 replies 8 participants last post by chevy_man Apr 18, 2011 Chevy Forums FREE technical assistance for your restoration and repair. I've got 157, 000k on my 93 Z engine. uiuemb uitji djjaqg oxg yjjpz evot dowzcnx qmt nbnzac eae bdy toxcnoy ymwhh yvwsqm rcohktbp