Question about 1990 Honda Civic

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Idle varies way too much

1990 Honda Civic

Just replaced head gasket.

Pretty sure cam is aligned to crankshaft properely and all connectors/hoses connected.

When car is warm, timing at idle changes from +18BTD to about more than 40BTD. This cause idle speed to vary from 700rpm to 2100 or more rpm. Disconnecting vacuum line to MAP keeps idle steady and timing at 18BTD, but idle is rough. Shorting timing connector has no effect.

Any ideas?

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Try replacing your map sensor or your throttle position sensor.

Posted on Nov 23, 2008

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1990 Honda civic si.....overheating...was told that head gasket is shot...done a compression test on all 4 cylinders...all had at least 135 psi or higher...antifreeze is clean..no oil...although overflow...


Hi, I have a way to test for a blown head gasket. Since you have good compression, yours would have to be small. Recommend you park on an incline, remove the radiator cap, set the heater on high, start the car and let it warm up until there is flow in the radiator. Fill the radiator and keep it full while the engine continues to run. Look for any bleed ports the system may have either in the hoses or at the attach point housings. Crack any bleeders open to allow any air out. Top off the radiator all the way to the neck and make sure there are no bubbles coming up. Bubbles coming out the radiator are an indication of a blown head gasket.
Please let me know if you have questions, and thanks for using FixYa.

Apr 09, 2011 | 1990 Honda Civic

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Can you please give me the tappet settings for a Honda civic 2004 1.6 Vtec please.


Do you mean 1.7L? I do not see a 1.6L in the manual. Instructions from autozone.com are pasted below.

lash:

Intake, 0.007-0.009 in (0.18-0.22mm).

Exhaust, 0.009-0.011 in. (0.23-0.27mm)

Civic
1.7L Engine

NOTE Adjust valves only when the cylinder head temperature is less than 100 degrees F.

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section. Disconnect the negative battery cable.
  2. Note the radio security code and the radio presets.
  3. Remove the ignition coil cover. Remove the ignition coils. Remove the throttle cable clamps and harness holder from the cylinder head cover.
  4. Remove the cylinder head cover retaining bolts. Remove the cylinder head cover from the engine.
  5. Remove the grommet from the upper cover and disconnect the camshaft position (CMO) sensor connector. Remove the upper cover.
  6. Set the number one piston at TDC. The UP mark on the camshaft pulley should be at the top, and the TDC marks on the pulley should line up with the top edge of the cylinder head.
  7. Using the proper gauge feeler gauge, adjust the valves on cylinder number one.
  8. Rotate the crankshaft 180 degrees counterclockwise. The UP mark on the camshaft pulley should be toward the exhaust side of the cylinder head.
  9. Using the proper gauge feeler gauge, adjust the valves on cylinder number three.
  10. Rotate the crankshaft 180 degrees counterclockwise and bring the number four piston to TDC.
  11. Using the proper gauge feeler gauge, adjust the valves on cylinder number four.
  12. Rotate the crankshaft 180 degrees counterclockwise. The UP mark on the camshaft pulley should be toward the intake side of the cylinder head.
  13. Using the proper gauge feeler gauge, adjust the valves on cylinder number two.
  14. Install the cylinder head cover.
  15. As required, reprogram the ECM/PCM engine idle characteristics. Be sure all electrical items are OFF.
  16. Start the engine. Hold the idle speed at 3000 RPM-s in park or neutral until the radiator fan comes on or the temperature reached 194 degrees.
  17. Let the engine idle for about five minutes with the throttle fully closed.
  18. If the radiator fan comes on during the five minutes, do not count this toward the five minute programming time.
  19. Set the clock.

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1 Answer

I want to change the timing belt of my car. Can you give me detailed instructions on how to do it.


I have pasted the instructions from autozone.com below, but I never recommend this chore for a novice. If the valve timing is not right, it can ruin your engine. If you have not done this before, I recommend you at least have a mechanic look at the belt before you close up the timing cover.


Removal & Installation

1.7L Engine
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Note the radio security code and the radio presets. Disconnect the negative battery cable.
  3. Rotate the crankshaft to set the engine at Top Dead Center (TDC) on the compression stroke for the No. 1 piston. The white mark on the crankshaft pulley should align with the pointers on the timing cover. Once the engine is in this position, it must not be disturbed.
  4. Raise and support the vehicle safely. Remove the front tires. Remove the splash shield. Lower the vehicle.
  5. Remove the power steering pump and position it to the side without disconnecting the hoses. Remove the alternator.
  6. Remove the ignition coil cover. Remove the four ignition coils. Remove the throttle cable clamps and harness holder mounting bolts. Remove the cylinder head cover. Remove the crankshaft pulley.
  7. Properly support the engine using a block of wood under the oil pan. Remove the upper bracket.
  8. Remove the grommet from the upper cover. Disconnect the camshaft position (CMP) top dead center (TDC) sensor connector.
  9. Remove the side engine mount bracket.
  10. Remove the crankshaft position (CKP) sensor from the oil pump, without disconnecting the connector.
  11. Apply slight force to the timing belt at the midpoint between the camshaft pulley and the water pump pulley and check that the auto tensioner moves smoothly, if not replace it.
  12. Move the auto tensioner to remove tension from the timing belt. Remove the timing belt.
To install:
7ea3b6e.jpg
    Fig. TDC alignment mark locations for the crankshaft sprocket-1.7L engine




46a4de6.jpg Fig. Timing belt sprocket TDC mark positioning for timing belt installation-1.7L engine

  1. Set the crankshaft to TDC. Align the TDC mark on the timing belt drive pulley with the pointer on the oil pump.
  2. Set the camshaft to TDC. The UP mark on the camshaft pulley should be at the top. Align the TDC marks on the camshaft pulley with the top edge of the cylinder head.
  3. Install the timing belt in a counterclockwise sequence, starting with the drive pulley.
  4. As required, replace the auto tensioner assembly.
  5. Continue the installation in the reverse order of the removal procedure.
  6. Reprogram the ECM/PCM engine idle characteristics. Be sure all electrical items are OFF.
  7. Start the engine. Hold the idle speed at 3000 RPM-s in park or neutral until the radiator fan comes on or the temperature reached 194 degrees.
  8. Let the engine idle for about five minutes with the throttle fully closed.
  9. If the radiator fan comes on during the five minutes, do not count this toward the five minute programming time.
  10. Set the clock.

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