Top 20 2004 Chevrolet TrailBlazer - Page 3 Questions & Answers

check if the speed sensor melted again. Then you have a problem of figuring out where the short is. You'll need a mechanic to help with that cuz the variables are a lot. but double ck the wiring going into the speed sensor for fraying/broken wires., look in the connector to see if there is any gunk. hope this helps a little.

On the right side of the engine boss right ahead of the cylinder head if I remember correctly its under the alternator or what ever accessory is in the upper front corner of the engine. Passenger side/Right side. Hope this helps. Thats for the serial number, block cating number is on the block boss back where the oil pump drive is, right where the transmission bolts to the cylinder block at the top.

Probably going to be your secondary air injection for the I6 engine. Normal for this to start "humming" at start up then disappear.

Check the belt tensioner to see if it's weak or worn. See post below. The compressor sound may be the secondary air pump kicking in. If so, that's normal on a cold start Diagnose belt tensioner

Hard to say - not being very careful when replacing the battery can generate voltage spikes that can damage electronic equipment in the vehicle, or put certain processors in a locked up state. You can try disconnecting the negative battery cable for a few minutes and then reconnect it to see if the various systems reset themselves. If the problem persists, your HVAC control module may be damaged. As far as the rear air is concerned, you first should check the wiring and connector on the switch - may not have been connected properly, the switch may have been damaged or a wire may have been cut.

I should guess it to be the electric fuel pump, although I thought those sounds had been eliminated by the manufacturers long ago. Perhaps you could raise the car in the air and get underneath it and see ( or I should say "hear") That sound from the fuel pump should not mean it is bad or is going bad. God bless your efforts.

I agree with Enrique. Just to add, Maybe you can take shift linkage loose and move tranny lever by hand, see if you can get it into park position? There are safety issues trying to do that, You don't want the vehicle to move. Safety is your responsibility. If the vehicle is on an incline, you may need to nudge it a little, so the tranny isn't holding the vehicle. Can you check for applicable tranny codes, if there are any? Just because the dash lites come on, doesn't mean the battery has a full charge. Just my opinion.

Possibly a defective ABS sensor, or low brake fluid. Recommend a reputable mechanic to assess the issue.

Low beams don't work ??????? But high beams do ????? DRL - daytime running lamps ? HDM relay # 46 low beam relay , under hood fuse box.

could be a big end or main bearing but there are a few simple checks that can be done first 1--have the oil pressure checked using a mechanical gauge if there is a bad bearing there will be low pressure at idle 2 --check the exhaust for smoke under load if there is a bad bearing , the escaping oil will overload the oil ring and produce smoke ( if smoke comes after idling at lights and on taking off that is valve stem seals) 3--- run the fault codes and check for knock sensor problems the noise could be detonation under load from lean fuel mixture or incorrect timing 4---check the ignition timing 5-- run the engine when it is knocking and remove a plug wire and see if the knocking stops bearings will stop knocking if there is no combustion to place load on the crankshaft That will also indicate which big end you have to check if you have to pull the sump Too far advanced will cause the pistons to slap the cylinder walls hard for too far advanced ignition you statement that the noise goes after 40 indicates that it is not a bearing as the high the rpm the louder the noise taking the foot off the pedal indicates detonation lastly if all the checks prove good , you could always have the sump removed and check each big end and main individually for damage sometimes a failing cam chain if fitted ( no motor identified) will knock as the chain hits the timing cover

The first thing to do get it checked for DTC'S - diagnostic trouble codes . Not at auto zone or any other parts store , you want to have full scan of all the modules on the car. Don't know how much you know about automotive electronics , computer controlled systems etc.... Your vehicle has at least 10 modules (computers ) on board , there all talk to each other on a serial data network . C.A.N - controller area network . Or in the case of GM it has it's own . GMLAN - How to Diagnose Controller Area Network CAN When you turn that ignition switch to start it is an input to the computer ,be it the PCM or BCM ..

Water is certainly getting into something electrical that should be sealed (maybe because of a windshield leak). You will have to find out where the water is getting in - under the dash, or if there is a loose electrical connector or the fuse cover is loose under the hood.

Are you on an incline? If so try rocking your vehicle forward and backward with others helping you. Your transmission may be bound. While the vehicle is rocking you should be able to shift the transmission into neutral.

the po740 is a torque converter, clutch malfunction alarm the po753 the PCM has detected an electrical problem in the shift solenoid (usually faulty shift solenoid. the p1860 TCC, PWM solenoid electrical circuit If it was my Blazer buy new solenoids and replace them.

There are internal valve timing parts that are not operating correctly. Take it to a dealer to find out whether your warranty will cover the repairs.

You need to have your insturment cluster repaired ! How to repair GM Instrument Cluster Speedometer Gauge Stepper Beside stepper motor problems the solder used on these clusters have a problem called silver migration . Can cause all kind of problems ! What this video from eric at south main auto . Chevrolet Truck Battery Dies Overnight Part II YouTube Chevrolet Truck Battery Dies Overnight Part

Get the trouble codes read. Otherwise you're totally in the dark about which wheel is causing the problem

as a florida resident for over 30 yrs and a mechanic I'm Not a big fan of sunroofs I'm a convertible man. a sunroof can be a real problem and costly to repair. may I suggest pulling the fuse and not using the this feature as they are prone to leaking. this situation sounds dangerous and should be off line until a solution is found.

Check the back emergency brakes, I have seen them fall and catch.It is just a horse shoe looking part.

check power steering pump --fluid level and operation ==also check the steering rack