Feb 222017

Chevy MalibuWould it be easy and not take long, for a skilled car mechanic, to sabotage my rack and pinion …. If He (the saboteur) had a vendetta against me? The person (who would commit such a crime) would have EASY access to the inside and outside of my car, which is parked on the street. Signed, Stuart


Yes, but it would seem much easier to break a windshield or flatten a tire.

Faint Spark 2001 Chevy Blazer S10

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Feb 222017

1991 Chevy S10 BlazerOn my blazer I have changed the crankshaft sensor the ucm and the ignition coil pack. Even went as far as changing the ignition switch in the steering wheel. I am getting a very faint spark from the coil pack and its not starting the truck. What could the problem be?


Weak or Faint Spark

In battery system, weak spark may be due to low battery voltage. Low voltage won’t allow proper magnetic fields to be created across primary and secondary windings of coil. Bad battery contacts, bad ignition switch contacts, faulty connection of any wire in ignition system can also cause weak spark.

Flaw in ignition module may cause weak spark. Best test method to simply replace module with known good module and try to start engine.


On the HEI you have 4 main parts that gives the spark.
  1. The coil (mounted in top of distributor cap)
  2. Under the coil is a carbon bushing with spring on it.. This touchs bottom of coil and sticks through cap and hits the rotor button… Think of this carbon button as your ‘coil wire’
  3. Inside the distributor you ten have the magnetic pickup coil.. The round star looking thing that the shaft sticks up through.. This is the main working part of distributor.
  4. Then you have the ignition module.
A weak spark is normal for 1 of a few things.
  • Your not getting a good full 12 volts to the distributor
  • The coil is going bad
  • The carbon button is worn down too much
  • Or the module is going out..

Temperature Light 1984 Chevy El Camino

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Feb 142017

1984 Chevy El CaminoThe coolant temperature light doesn’t come on when ignition is on and in the “bulb test” mode. Is there a procedure to check the system?  The bulb is OK.   The Alternator and Choke lights both come on properly.


I would think you could simply take the Green wire where it connects to the temperature switch and ground it directly to the side of the block. This should illuminate the light bulb.

Coolant Temperature Light Switch Wiring Diagram

Dash Wiring Diagram 1984 Chevy El Camino

Feb 092017

1989 Chevy TruckI rebuilt my 5.7L engine, all new parts, pistons .030 over everything else stock, tbi. wont start, oil squirts from oil pan gasket, oil filter under big pressure. when this resolved 1 other top end question.


Sounds like there is some sort of restriction in the oil passages or crankcase. Do you have  a crankcase breather and a PCV valve installed in the valve covers? Does it still spew oil out of the oil pan with the valve cover removed?

Engine Crankcase Pressure

If the engines crankcase does not have a place to vent all the pressure will build with no place to go.

Feb 022017

1992 Chevy S10Would a broken map sensor connector cause an odb1 engine code 33 and 34? Right now I have the connection zip tied, but it just will not run right. It is a 1992 Chevrolet S10 2.8 v6.


Yes. If the engine sensor is unable to transmit the frequency to the ECM it will illuminate the check engine light and possibly store code 33 and code 34. The ECM monitors the frequency and thus determines airflow into the engine. Typical idle MAF is 5 to 7 grams per second.

Chevy Engine Code

Feb 022017

2005 Chevy SilveradoI have a 2005 Chevy 2500HD 4X4 that the rear differential is going bad in. It has a 6.0 gas engine with the stock auto transmission and transfer case. I have found a 2006 Chevy 2500HD with the Duramax engine and Allison auto trans and stock transfer case. My question is will the rear end from the 2006 pickup fit my 2005?



If you are buying this replacement differential from a junkyard you may want to inspect it since it is used.

Differential Inspection

  • Check the pinion gear shaft for unusual wear.
  • Check the pinion and the side gear teeth for wear, cracks, scoring and spalling.
  • Look at the thrust washers for wear.
  • Check the fit of the side gears in the differential case and on the axle shafts.
  • Check the differential case for cracks and scoring and replace all of the worn parts as necessary.


Bearings Inspection

Carefully and thoroughly inspect all drive unit parts before assembly. Thorough inspection of the drive parts for wear or stress with subsequent replacement of worn parts eliminates costly drive component repair after assembly.

Important The differential bearings and the bearing cups are matched sets. Replace both the bearing and the cup when either part requires replacement.

  • Lubricate the bearings with axle lubricant. Inspect the bearings for smooth rotation.
  • Look at the bearing rollers for wear.
  • Inspect the bearing cups for wear, cracks, brinelling, and scoring.
Jan 312017

1998 Chevy BlazerI need a transmission solenoid estimate. How much with parts and labor should changing 2 solenoids cost in transmission? Also, if you change 2, how likely is it that others might fail?


Shift solenoids are around $20 each on amazon with the torque converter clutch solenoid around $30. They also offer a 5 Solenoid piece kit under $100. Just depends what direction you want to go. And lastly you are going to need some transmission fluid and a new filter and gasket. About 6 quarts of transmission fluid at around $3. A Transmission filter and gasket kit around $30.

Now we know a shop is going to charge a mark up on the parts and may also want a diagnostic fee and some extra shop supply fees.

Transmission Solenoid Estimate

  • Total Parts + 50% markup = $225
  • Total Labor @$100 per hour(shop rate) = $225
  • Diagnostic fee = $75
  • Shop supplies(rags, cleaners, etc) = $25
  • Tax @7% = $38.50

Total Cost Estimate for 2 solenoids = $588.50 (low end estimate, dealership may charge more)

Total Cost Estimate for 5 solenoids = $765.05



50/50 chance of failure with other solenoids.

Labor time would be about 2 hours for replacing one solenoid. Add an additional 15 minutes for each additional transmission solenoid.

Converter Clutch Solenoid Assembly, Replace (b)

Labor Times
Comments Factory Regular Severe
1.4 1.9 2.2
Comments Factory Regular Severe
w/skid plate add 0.0 0.3 0.3
Jan 312017

1998 Chevy CavalierWhere would you find the torque converter clutch with pulse width modulated?


You would find this installed in the transmission valve body.

torque converter clutch

Torque Converter Clutch (TCC) Solenoid and Switches Replacement

Removal Procedure

  • Remove the valve body cover.
  • Remove the transmission mount bracket.
  • Disconnect the solenoid wire harness from the case electrical connector.
  • Disconnect the wire leads from the pressure switch.
  • Remove the torque converter clutch solenoid bolt from the control valve body.
  • Remove the 3rd clutch pressure switch.
  • Then Remove the 2nd clutch pressure switch.

Installation Procedure

Caution! Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  • Install the 2nd clutch pressure switch, if applicable.

Tighten to 12 N·m (124 lb in).

  • Install 3rd clutch pressure switch.

Tighten to 12 N·m (124 lb in).

  • Install the torque converter clutch solenoid bolt to the control valve body.
  • Install the O-ring.

Tighten to 12 N·m (124 lb in).

  • Connect the wire leads to the pressure switch.
  • Connect the solenoid wire harness to the case electrical connector.
  • Install the transmission mount bracket.
  • Install the valve body cover with a new gasket.
  • Inspect the oil level.
Jan 302017

1999 Chevy CavalierMy car wont start. I changed the starter. I change the battery. Also change the ignition. The only power that comes on is the dome light and the hazard. When I turn the ignition to “ON” nothing happens.


Wont Start

You can check to battery positive at the “S” terminal on the starter while someone holds the ignition key in the “START” position. If you see battery positive, check the ground. If both are there, replace the starter. It is possible to get a BAD, new starter. If you do not see battery positive at the “S” terminal on the starter you will need to trace the wiring to see why not.

Could be as simple as a blown fuse. Start by checking the main 50 amp fuse and also check the battery voltage at terminal “B” on the starter to make sure your fusible link is good.

Next you will check the neutral switch or clutch pedal switch, depending on if it is an automatic or standard shift. If those check out, the wiring and ignition switch are the only things that are left.

1999 Chevy Cavalier Starting System Wiring Diagram



Jan 262017

 Chevy SilveradoDifficult to start, I have to crank the engine 3 to 4 times.
Fuel pressure ok, new fuel filter installed.
Is there like a throttle solenoid or something causing the problem? thanks


Possible Causes:

  • A leaky fuel pressure regulator
  • A small vacuum leak
  • Intake leak
  • Sticking IAC valve – most common

We are assuming the check engine light is not on.