Question about 2002 Chevrolet TrailBlazer

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2002 trailblazer lxt codes p1516 & p1220

I cleaned the throttle body and checked the connection on both the gas pedal and throttle body and were both ok..my tb has a new battery in it but if the alternator goes bad would it cause this issue to happen as well? When I was draining it just shut down and won't start..if indeed the pedal sensor is bad would it cause the to not to start if the throttle body is good?

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I had a problem with no start issues,i found the little motor that works the the throttle valve was not working.i replaced throttle body and now i have
had no more problems

Posted on Mar 30, 2014

Testimonial: "So I tested the throttle body and it's at a 48% when the car is just in the on position and not running.. Do you what the percentage the throttle body is suppose to be at when in just the on position"

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  • Justin
    Justin Mar 30, 2014

    "So I tested the throttle body and it's at a 48% when the car is just in the on position and not running.. Do you what the percentage the throttle body is suppose to be at when in just the on position"

  • fredcota
    fredcota Mar 31, 2014

    i am, not sure but do you have fuel reaching the engineand if not try spraying a little fuel into your throttle body then close it up and try to start it,also does your throttle valve open and close easly

  • Justin
    Justin Mar 31, 2014

    I can manually do with my fingers and it open and shuts back at an angle to where it was

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First off when you say it won't start does the motor turn over but won't start or does it do nothing

Posted on Mar 30, 2014

  • Justin
    Justin Mar 30, 2014

    The motor turns but won't start up

  • Brandon Madison Mar 31, 2014

    Do you have a way to check for fuel pressure?

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6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

pippall
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SOURCE: 1987 chevy S10 engine idle problem

relace the throtle air idle valve.The temp switch will allso cause this problem.

Posted on Jul 19, 2009

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SOURCE: code p0121 TPS

THERE IS A TP SENSOR BUILT INTO THE THROTTLE ACTUATOR. THESE TRUCKS HAVE BEEN KNOWN FOR A FEW PROBLEMS IN THIS AREA. THROTTLE ACTUATOR IS NOT SERVICEABLE. THE THROTTLE BODY WILL NEED TO BE REPLACED IF IT IS PROVEN FAULTY. THE APP SENSORS ARE LOCATED IN THE GAS PEDAL MODULE. THESE SEND SIGNAL TO COMPUTER TO TELL IT WHERE YOUR FOOT IS, THEN COMPUTER SENDS COMMAND TO THROTTLE ACTUATOR TO OPEN OR CLOSE THROTTLE BASED ON THIS INPUT. THE SENSOR IN THE THROTTLE ACTUATOR DELIVERS A MESSAGE BACK TO THE COMPUTER TO TELL IT WHAT THE ACTUAL THROTTLE POSITION IS. IF THESE SIGNALS DONT MATCH(WHERE THROTTLE IS COMMANDED AND WHERE IT ACTUALLY IS)THE CHECK ENGINE LIGHT WILL ILLUMINATE AND THE VEHICLE COULD GO INTO A REDUCED POWER MODE. HOPE THIS HELPS YOU!

Posted on Sep 07, 2009

  • 1 Answer

SOURCE: 2006 Chevrolet Trailblazer. Battery Ok.

Hallo

have the same problem with my Trailblazer, has someone a solution ?

Posted on Jun 03, 2010

  • 1 Answer

SOURCE: 2003 Silverado 1500 HD 6.0 Liter starting issues

I am having the same issues on my Chevy 03 HD 1500. It takes at least two turns of the ignition to get it going. I have replaced the battery, Fuel Filter, Fuel Engine Relay and I am now Replacing the Starter Engine Relay. If you have any other suggestions let me know! I will share as well. Also, last couple of days Oil Pressure Gauge is acting strange. It will read from 1/4 point to 3/4 point while driving. Working on that as well.

Posted on Sep 10, 2010

dttech
  • 4803 Answers

SOURCE: Have 2003 chevy tahoe with

There is a Tecnical Service Bulletin (TSB) that specifically addresses codes P0120, P0220, and P1516.

It says that the TAC Module can set these codes erroneously under certain conditions. It is very likely that if your vehicle is diagnosed according to the provisions of this bulletin, the problem can be corrected without having to purchase or replace any parts.

It is Technical Service Bulletin number 03-06-04-032
Issued June 16, 2003

Please also review this article: What Else Could Be Wrong?

Posted on May 07, 2011

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You might want to try this take your throttle body out and give it a good cleaning with TB cleaner try to clear all black stuff out of it make sure you pay close attention to how is everything on this might have TB positioning sensor is important that this goes in the same way you can also go online find HOW TO CLEAN THROTTLE BODY good luck

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Hi, if you feel the click in the gas pedal it is the throttle cable not seated in the pully that opens the TB. The stopper will work itself loose if the cable is old or if you tamper with the TB pully. (i.e. reving engine by hand at TB under the hood.) Check cable at TB and be sure to pull it tight so the lead stopper on the cable is secure and seated. Not seated will cause the cable to wander in the pully. If the throttle feels sticky or clicks clean the TB with some gumout.

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Cleaning your throttle body should take care of both problems. Clean your throttle body with throttle body cleaner. First disconnect the battery, clean the TB with TB cleaner, must be nice and shiny. When finished, hook the battery back up and drive around for 20 minutes or so with all accessories off, so the computer will relearn a properly functioning throttle body.

Your computer learned some bad habits, so when you changed the battery, the computer thought the throttle body was clean and functioning properly. So when you changed it, this caused all your problems. Very common, keep your throttle body clean, should be done at least once a year. Total cost if you do it yourself is around $5, for the can of TB cleaner.

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My truck turns off when i put on the A.C on or the defoger also the radio turns on and off and when I turn on the truck it has a tik tik tik sound.


Very common problem after the battery has been disconnected or a battery change. Clean your throttle body with throttle body cleaner. First disconnect the battery, clean the TB with TB cleaner, must be nice and shiny. When finished, hook the battery back up and drive around for 20 minutes or so with all accessories off, so the computer will relearn a properly functioning throttle body.

Your computer learned some bad habits, so when you changed the battery, the computer thought the throttle body was clean and functioning properly. So when you changed it, this caused all your problems. Very common, keep your throttle body clean, should be done at least once a year. Total cost if you do it yourself is around $5, for the can of TB cleaner.

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Replaced my battery and now when I put On the defroster or A/C the enginr stalls and is running rough. When I stop sometimes the engine surges and car bucks forward. Need some HELP PLEASE!


Very common problem after a battery change. Clean your throttle body with throttle body cleaner. First disconnect the battery, clean the TB with TB cleaner, must be nice and shiny. When finished, hook the battery back up and drive around for 20 minutes or so with all accessories off, so the computer will relearn a properly functioning throttle body.

Your computer learned some bad habits, so when you changed the battery, the computer thought the throttle body was clean and functioning properly. So when you changed it, this caused all your problems. Very common, keep your throttle body clean, should be done at least once a year. Total cost if you do it yourself is around $5, for the can of TB cleaner.

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clean the throttle body, a build up at the throttle plate will cause this 'sticking'-remove the air tube that goes from the air filter housing to the throttle body, and look down the throttle while you manually open the 'butterfly'-guarantee it is dirty. Clean it good with throttle body cleaner (use a rag to wipe/dry out the TB).

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So IAC has been replaced. Sounds like a dirty throttle body, EGR valve, or vacuum leak. DId you do the maintenance yourself. If so then you should be able to inspect Throttle Body to determine if black and dirty.. this can cause intake problems leading to your issue adn rough idle. EGR valve sends exhaust gas back into combustion chamber to reburn it and make car more environmentally sound. If stuck open it can allow too much exhaust into combustion chamber causign a lean mixture, too much air can cause this.. Vacuum leak can also allow too much air in. Start with easiest and check Throttle body, then EGR valve, finally for vacuum leaks. Depending on your skill the EGR can be cleaned as can the throttle body.. a good link for TB cleaning is http://www.popularmechanics.com/cars/how-to/repair/1272341. A vacuum leak may be harder to diagnose. You are compensating by depressing gas pedal telling ECM to send more fuel to motor to overcome this issue thats why it will run and start with gas pedal pressed.

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