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Has code 42 and 44 They just installed new tbi

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Go to google input trouble codes 42, 44 in search and read explanation

Posted on Nov 01, 2013

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A new sensor was installed on TBI carb. to control air plus the new high volume gas pump. Did same show when driving. What else could be?


No such thing as a TBI carb. It's either fuel injected or carb, not both. What are the symptoms and What's the year, make, model and engine?

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Gas pedal at idle will rev engine for a second and then wont rev anymore ran dtc scanner did not get any tbi codes


You don't have TBI on that car. You have a drive by wire car. You should have got APP or ETC codes. If the check engine light isn't on and you get no codes at all. Your probably looking at a PCM replacement. Wiring should be checked before replacing it.

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My 89 camaro 5.0 TBI starts and idles good. It will not accelerate and acts like its starving for gas. There are no codes showing up.


Check your repair manual for ECM voltage and signals! There is no communicatiin between the the ECM advance and the engine beyond idle..........

Jan 28, 2014 | 1988 Dodge Dakota

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I have a high idle problem , with a 91gmc 1500 no codes but my scanner has a troubleshooter guide it says the seal gasket for the TBI is leaking vac I tested the TBI and it is working properly so I...


With the TBI, the AIC solenoid can get stuck and cause problems. It's on the passenger side of the TBI assembly and should have a four wire harness attached.

May 07, 2011 | 1991 GMC Sierra

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90 chevy 350 with TBI starts but wont stay running changed fuel filter and fuel regulator dont know what next


I have a 90 chevy k1500 350 tbi with same problem! I have traced problem to... after turning on key fuel pump kicks on when u crank it over injectors shoot gas and truck starts! After few seconds injectors stop spraying and truck dies! This can happen many times over and over! Eventually sometimes truck stays running and all is great! I changed ignition module, oil pressure sending unit (which i was told controls gas after vehicle is running) fuel filter, computer, fuel pump relay, I am at a loss now! Hope this helps and hope someone can help me!

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1991 gmc med duty truck with 454 tbi ,backfires, no power.


By module do you mean computer? There's nothing wrong with it. Yea, replace all ignition components with new ones. New cap, rotor, wires and spark plugs.

May 18, 2009 | 1991 GMC K2500

1 Answer

Can't get higher RPM's, mileage down to 5 mpg


Rob, it sounds like a throttle position switch to me. My 95 suburban with TBI had a similar problem and that fixed it. You may need a volt/ohm meter to rig it if you don't have a code reader that will monitor the values. I think the switch was about $25. Not sure if yours has a TBI or carburetor.

Good luck

Jan 15, 2009 | 1991 Chevrolet Suburban

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W or tbi engine in 2000 chev blazer


It is Throttle Body Injected (TBI)

Jan 03, 2009 | 2000 Chevrolet Blazer

1 Answer

97 pathfinder hesitates bucks and stalls at lights, already put plugs distributer and mass air flow censor


Check throtle position sensor behind the TBI. Run mode 4 in the computer diagnostic checks to see what codes is giving.

By the way, if any of the sensors give a code, don't spend money replacing them. They are all inter related. If one fails you will get codes for the others also. What you really need to do is above suggestion and then trace the circuits for continuity. Am assuming you know how to run ECM codes in the computer. Eliminate codes one at a time, and re-run mode 4, until all codes have been eliminated.

If code 55 is in the computer. Replace the whole TBI. After 20 years of use, they appear to corrode inside. But try the below first in the interest of saving money.

You might want to remove the TBI. Don't disturb the pre heater underneath the TBI if is stuck to it.
Take choke cleaner (Pep Boys or Autozone) Carb and Choke Cleaner in yellow can. There is an opening in the pre heater for the Air Flow Sensor, liberally spray it with the plastic little nozzle attached to the can and ensure all the gook in the passage way is clean, spray until no more junk comes out. Remove mass air flow sensor from TBI before doing this. You don't want to damage it. Spray the passage way from MAFS side also. While you have the TBI off, look at the port for EGR VALVE see if its clogged up with Carbon. Clean them out you can remove the carbon by scraping with a phillips head or bladed screwdriver. Two holes leading to the EGR Valve. They are about 1/2 inch in diameter round holes. Flush with the carb cleaner. If you really want to do ir right, remove the EGR Valve, clean it also and check to make sure its working. If NG replace it. Your EGR valve might be getting stuck due to carbon in the open position thus letting to much air into the intake manifold thus cunking out. Or the EGR has a leak. Check with vacuum pump by attaching VP to EGR. It should hold steady with 20 - 30 vacuum on the EGR. If it does not hold, throw it away and buy a new one.

You mentioned you replaced the MAFS. Remove it again and look in the element. Is it Wet or Dry?
It should be dry. Don't touch it. If its wet, then your air passages are clogged in the TBI. While you have the TBI out, spray all the vacuum fittings with the carb cleaner ensure they are free of blockage. Replace everything back carefully. Your truck should idle at 850 rpms if its standard and 700 if its auto. + or - 50 rpms. 850 is ideal. Let me know what happens after all of that.

Last but not least. Check the hose to the PCV Valve, ensure is not cracked, if damage, replace the hose and replace the PCV Valve. Ensure all vacuum hoses have no leaks and are correctly routed, especially the EGR valve one. From the manifold connect hose to center vacuum port or bottom port on the Solenoid Cut off Valve. Connect port B (Middle one to the EGR Valve.) Connect Port A (top one) to the Air Filter Canister. With the car on there should be continuity between port C and and B. You can check that with the vacuum pump. Gun the engine and see if you get a momentarily reading on the gauge if yes the port is good. If NO the Cut off Solenoid is NG. Find a working one in junk shop they are $100 bucks at the dealer. (highway robbery) If you are in PA go to Harry's U pull it. 5 bucks, each take the vacuum pump so you can check it before buying. The suffer from corrosion in the ports. Hope this solves your problem. Good Luck!

Aug 07, 2008 | 1988 Nissan Pathfinder

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