A faulty ignition control module can cause a number of problems. Chevy 350 TBI bogs on acceleration due to the following reasons: Leaky vacuum lines. Sometimes, a fuel pressure regulator can become stuck open, which means that it does not close properly. 8 time out of ten code 44 is due to low fuel pressure or if one of the two injectors not firing. Filter screens get gummed up. Injectors are above throttle blades so pressure is constant you can. I have a dead miss on one cylinder at idle - confirmed by cylinder drop test, vacuum gauge shows fast fluctuation 19-21 inHg, and the spark plug is significantly blacker than the others. Turbo city actually markets an adjustable fuel pressure regulator for approx. 9. Testing for Fuel Pressure on a TBI System. make sure fuel pressure above 10 psi because throttle body need at least 10 psi. I replaced timing chain, injectors, tune-up and fuel pressure regulator. JEGS TBI Fuel Injector Spacer Chevy/GMC Truck. 7L pick up (van, mini-van, SUV). more info. Replacing the fuel pressure regulator (fpr) is a similar process for almost all car. Published by Dustin Babich on 31 May 2023 The fuel pressure specs for a chevy 350 tbi engine is 9. I have a 1992 Chevy C1500 4. It is also a 3800 fuel pressure regulator symptom. Remove a spark plug and examine the end of it. #1 · Sep 14, 2017. Second one was when the fuel tank switch failed. Product Q&A View Now. When it goes bad, the engine may hesitate, stall, and. motor is new . For Vortec engines, fuel injectors are rated at 19#/hr at 42. MEMBER. This is the girlfriend's '93 C1500 5. if you can what kind of tbi, year of your truck. . . Every TBI will be Flow Bench tested, calibrated, and idle adjusted making it ready for easy installation. The GM TBI throttle body has the pressure regulator built into it. Your 95 model year TBI should still be 9-12 psi. Part Number:. There is a good chance that your Chevy 350 TBI is bogging due to a lack of fuel. When it goes bad, the engine may hesitate, stall, and have… Reconnect fuel lines: Reattach the fuel lines to the new fuel pressure regulator, using the quick disconnect tool. The pressure regulator may be bad, or an injector could be leaking. Lightly lube the O-ring with clean engine oil before assembling the adapter. . 16 psi is to the high end but completely managed by the tbi fuel pressure regulator. 5 psi, but the stock fuel pressure is actually at 60 psi (22-23 #/hr). Fuel is delivered to the throttle body injection system by an electric fuel pump located in the fuel tank. i unplug the fuel pump relay. once it warms up runs fine. A bad IAC can cause starting problems. On Sale. Buy Throttle Body Shop TBS 10321 GM TBI 18 psi Brown Fuel Pressure Spring:. 3L, 5. Engine Malfunction. If your engine is not over 250 horsepower, you can put an S&P adjustable fuel-pressure regulator on it and raise fuel pressure. SKU # 203277. Chevy Mechanic:. The filter screens in the fuel tank can gradually get. Inspect for External Damage: Visually inspect the regulator for any signs of damage, such as leaks, cracks, or broken connections. You should check to make sure the regulator is doing its job. How much fuel pressure does a 5. I am having low end power issues, along with backfiring until you get up to 3000 rpm. Waterbury, CT. Price: $83. Gave it a tune up, and it ran beautifully, which was my go ahead to begin going. Install fuel pressure gauge between steel line and flexible hose. This is generally way too high for a carb. When it goes bad, the engine may hesitate, stall, and. most are set around 12-16 and should never move from where its set. Sent from my HTC One X using Tapatalk 2. Runs rough in midrange, actually slows down during part throttle accelleration. 5. In my opinion. TBI fuel pressure regulators don't hold pressure after turning off the key. Messages. Proper fuel line pressure should be between 9-13 PSI. Under Pressure. CJeep77 said: WRONG - tbi is 11 to 14 lbs pressure stock! A stock tbi injector can go up to about 30 psi though:flipoff2: This is absolutely correct. Idle will be unstable and rough. 73 posts · Joined 2010. three seconds each time. 3 Vortec fuel pressure regulator can save lots of trouble and give you a head start at solving engine issues. Gasoline in the vacuum hose. Spark plug failure. Oct 14, 2009 • 1989 GMC Suburban. The fuel pressure regulator in the TBI and the fuel pump. line showed the pressure steady, so that meant the pressure. It sounds like a fuel pressure issue. Remember that there is a pressure regulator that is susposed to maintain that pressure. Hi I have a 1991 chevy Silverado that just started about a week or 2 ago misfiring randomly and cutting out under load. 63. The key is to get the right kind of pressure regulator in place to drop the PSI to a level perfect. Part Number: 561-61500. You may want to turn the key on for 2-3 seconds, then turn to start. The fuel pressure specs for a chevy 350 tbi engine is 9 to 13 psi. 2) Verify that the fuel pressure gauge is accurate. Invest in an AC Delco pump AND filter (a plugged filter will wear out a pump prematurely too). Everything ran great for about 200 miles, it was definitely WAY more fun to drive then when it was stock. CHEVROLET BLAZER. Like you said factory spec is 9 - 13 PSI, preferably 11 - 13. Same engine and TBI. Engine Size. An expert that got 10. Comes with the TBI adapter needed to check pressure the pump is a POS. My Web Site--darbys Elky. Here is a picture. 7-liter V-8 should have fuel pressure between 60 and 66 psi. if you have it you can see two lines for fuel one is bigger than the other. Joined Nov 15, 2002 Posts 122 Reaction score 0 Location. While dealing with the 4. One of the first symptoms of a possible issue with the fuel pressure regulator is engine performance issues. above 2003. 3. The throttle body has a fuel pressure regulator in it that can stick open leaving you with a low pressure issue, but you already replaced that, with no change. Part Number: 561-61510. Without a pressure regulator, the fuel pump can run. Some other names for this system: central port injection (CPI) "spider injector assembly". This equates to a 17% to 20% change in injector flow rate over the service range. #3. go to auto parts store buy noid light. 7L 350 TBI out of. Fuel pressure AND volume need to be checked. I'm running an inline TBI fuel pump made for this motor. 7 Vortec Fuel Pressure Regulator Symptoms: Knowing how to detect a bad 5. Verified fuel pressure - 6PSI low pressure pump, 30 PSI high pressure, measured at the TBI. Alright, here are the steps: 1. you can also have a bad fuel pressure regulator. Im in search of a regulator spring for the stock tbi regulator that has been made adjustable. Fuel Delivery System. Fuel Pressure is critical for proper operation. Bad Acceleration An early sign of a bad GM TBI fuel pressure regulator is bad acceleration. 3BELTWESTY 8K SNY Yes, too high a fuel pressure WILL cause a too rich condition, and your fuel pump is probably the problem. Chevy 350 tbi fuel pressure regulator symptoms can include engine hesitation, stalling, and poor acceleration due to fuel starvation. i have a 1987 Chevy 1/2 ton 4x4 with a 5. Jul 25, 2014. New Fuel pump 2. 1) Verify voltage at the fuel pump connection. my fuel pressure is at 18 psi, specs are to be 9-13 psi straight from the manual. Doing so will ensure that there is no power going to the fuel pressure. Save Article. The average fuel pressure regulator replacement cost is between $80 and $500, depending on the car model and labor costs. Now, I am here because I have a problem -- it is an '89 Chevy G20 (3/4 ton) conversion van with a 5. Faulty Fuel Pressure. The retainer mounts on top of the fuel pressure regulator cover. 7L/350 Chevy small block Gen I Fuel Pressure Regulators and get Free Shipping on Orders Over $109 at Summit Racing!. New Fuel filter 3. The DCS gauge between the throttle bodies reads the regulated pressure and that pressure can be only as high as the fuel pressure regulator has been set for. $98. Check Engine Light. Oh well At least I got to clean o. Pressure relief valve for safe, clean testing. When the engine is cranked and oil pressure closes the sitch 12v goes to the ecm on the same circuit that energizes the fuel pump. Signs of a Bad Fuel Pressure Regulator (External Vacuum-Operated Type) Over time, a vacuum-operated pressure regulator can fail—and that usually results in one or more noticeable symptoms. Black smoke from the exhaust. A little adjustment should be all that’s necessary, 1-2 PSIG at a time. The vehicle being tested in this video is a 1995 Chevy S-10 Pick-up 4. 454 TBI problems. In our shop yesterday we had a '99 suburban with the same result as yours after several test we replaced the fuel pressure regulator for about $45 from Orileys it is clamped to the end of the spider housing, that. 150. try a tap test on the ECM and see if it changes anything. 350 tbi-runs like dog poop. Injectors are re-manned Fuel pressure regulator is rebuilt Fuel. A fuel pressure regulator costs $30 to $200, and the average labor cost is $50 to $300. MAF is expensive though, find one off another car, because I don't recommend anything other than factory equipment. The engine control unit constantly monitors all the sensors in your car engine while you drive the car. Now to the too much fuel. This test helps you determine if the issue is related to fuel injectors, a fuel pump, or a fuel filter. Verified fuel volume just in case - will fill up a coffee can in 2 seconds. If it is sooty, it could be a sign of a bad fuel pressure regulator. some can leak back into the intake. Start the engine and let it reach operating. 5 posts · Joined 2017. how can i check the IAC and fuel pressure regulator? 97 6. These engines are notorious for carbon plugging up the vacuum ports in the throttle body causing it to not. 95 and back had the old low pressure tbi. New Fuel pressure regulator 5. TBI fuel pressure ideally should be 12 to 13 PSIG on the feed side at the throttle body. TPI needs more like 50-60psi. fuel pump,fuel pressure regulator,throttle position sensor, checked all. Spark Plugs Blackened. musicBetter Luck by tubebackr | promoted by 3. Question: I have a 1991 Chevy 1500. Shop Fuel Pressure Regulators at Summit Racing. hook up a fuel pressure gauge and see if the pressure drops when the motor falls on its face. Honda Odyssey Motor Mount Symptoms: Don’t Ignore These Warning. In tbi trucks, I look for 12-14psi and 2 quarts of volume with the engine running. It will not start unless I pour fuel in the carb. There are additional tests that can be done depending on your skill and available technology. 1997 chevy: 1500, has fire and fuel pressure, will not start. -$270. First you are going to need a HEI distributor, intake, and a fuel pressure regulator. I. Product Q&A View Now. 7/auto, used short block with fresh heads installed 25K miles ago - those of you that followed the project may remember I replaced a ton of items as well to ensure its reliability. May also want to check the spark timing. Continue.