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Forum: C4 Tech/Performance 12-25-2017, 01:30 AM
Replies: 2
Views: 483
Posted By Cliff Harris
Code 44 is an AFR code. That's caused by O2...

Code 44 is an AFR code. That's caused by O2 sensor problems. In '86 the O2 sensor is on the driver's side, so anything that happens on the passenger side is not a factor in this situation. You would...
Forum: C4 Tech/Performance 12-25-2017, 01:20 AM
Replies: 12
Views: 1,335
Posted By Cliff Harris
Check out these threads: ...

Check out these threads:

https://www.corvetteforum.com/forums/c4-general-discussion/3569629-led-headlights.html...
Forum: C4 Tech/Performance 12-25-2017, 01:12 AM
Replies: 9
Views: 409
Posted By Cliff Harris
The original brake system is made by PBR, which...

The original brake system is made by PBR, which is an Australian company. The exception to that is that the ABS system is made by Bosch.
Forum: C4 Tech/Performance 12-06-2017, 04:33 AM
Replies: 3
Views: 182
Posted By Cliff Harris
Does the fuel pump run for 2 seconds when the...

Does the fuel pump run for 2 seconds when the ignition is first turned on? That is controlled by the ECM through the fuel pump relay. The ECM turns on the fuel pump when it sees DRPs (Distributor...
Forum: C4 Tech/Performance 11-14-2017, 02:23 AM
Replies: 3
Views: 195
Posted By Cliff Harris
I've done several transmission cable...

I've done several transmission cable replacements. The main thing to be careful about is don't tighten the 15mm nut on the gear lever with the shifter in Park. If the trans moves into another gear it...
Forum: C4 Tech/Performance 11-14-2017, 02:13 AM
Replies: 3
Views: 202
Posted By Cliff Harris
The wires from the VSS go to the dash.

The wires from the VSS go to the dash.
Forum: C4 Tech/Performance 11-07-2017, 01:38 AM
Replies: 9
Views: 583
Posted By Cliff Harris
I had a problem with my voltage jumping between...

I had a problem with my voltage jumping between ~13 volts and ~11 volts. I took the alternator apart and cleaned everything and put it back together. That solved the problem and it hasn't reoccured...
Forum: C4 Tech/Performance 11-02-2017, 03:13 AM
Replies: 9
Views: 659
Posted By Cliff Harris
The carpeted piece(s) is held on with two fairly...

The carpeted piece(s) is held on with two fairly large bolts (1/2", if I recall correctly) and some miscellaneous screws. The dash plastic curves inward at the top and "captures" it, so you have to...
Forum: C4 Tech/Performance 09-23-2017, 02:22 AM
Replies: 4
Views: 238
Posted By Cliff Harris
Replace or upgrade the backlight bulbs. I put...

Replace or upgrade the backlight bulbs. I put LEDs in mine, which is a great improvement.
Forum: C4 General Discussion 08-12-2017, 01:36 AM
Replies: 1
Views: 190
Posted By Cliff Harris
Try this: ...

Try this:

https://www.corvetteforum.com/forums/c4-general-discussion/3418834-c4-seat-belt-lock-up.html
Forum: C4 Tech/Performance 08-11-2017, 12:59 AM
Replies: 17
Views: 514
Posted By Cliff Harris
The interior lights are controlled by the...

The interior lights are controlled by the courtesy light delay module. It is fairly common for the transistor that turns on the lights to short out (then they stay on all the time). It can also burn...
Forum: C4 General Discussion 08-08-2017, 03:31 AM
Replies: 18
Views: 646
Posted By Cliff Harris
The '86 model has several unique wiring changes....

The '86 model has several unique wiring changes. For one thing, the fog lights do NOT ground through the headlight filaments. They have an independent ground. That makes it much easier to do a HID or...
Forum: C4 Tech/Performance 08-07-2017, 03:06 AM
Replies: 33
Views: 1,119
Posted By Cliff Harris
Water expands a LOT when it gets warm. I think...

Water expands a LOT when it gets warm. I think you're OK and what you saw is normal.
Forum: C4 General Discussion 08-04-2017, 03:23 AM
Replies: 18
Views: 513
Posted By Cliff Harris
The old O-ring is still in the pump. You need to...

The old O-ring is still in the pump. You need to get it out before you can seat the new filter correctly.

One of these hook tools will do the job:
...
Forum: C4 General Discussion 08-01-2017, 03:03 AM
Replies: 4
Views: 260
Posted By Cliff Harris
That is a brake balance warning switch. If the...

That is a brake balance warning switch. If the pressure in the front or rear is higher than the pressure in the opposite brake circuit, that switch will ground and turn on the BRAKE light on the DIC...
Forum: C4 Tech/Performance 07-31-2017, 02:59 AM
Replies: 8
Views: 456
Posted By Cliff Harris
Some time in the '90s (I don't know what year),...

Some time in the '90s (I don't know what year), the SECURITY light function was changed to indicate VATS status. I assume the TDS and VATS functions were combined.

It sounds like your "little blue...
Forum: C4 Tech/Performance 07-30-2017, 03:26 AM
Replies: 15
Views: 712
Posted By Cliff Harris
The usual method for testing a VSS is to take it...

The usual method for testing a VSS is to take it out and spin it with an electric drill. Some speed should register on the speedometer.

The VSS is an AC motor that is operated as an alternator. It...
Forum: C4 Tech/Performance 07-30-2017, 03:10 AM
Replies: 8
Views: 456
Posted By Cliff Harris
In 1986 the SECURITY light is controlled by the...

In 1986 the SECURITY light is controlled by the TDS (Theft Deterrent System). TDS is the one that honks the horn if the door is opened while it's armed. It has NOTHING to do with VATS or the starter....
Forum: C4 Tech/Performance 07-29-2017, 12:31 AM
Replies: 39
Views: 16,930
Posted By Cliff Harris
The cold start injector and cold start thermo...

The cold start injector and cold start thermo switch have nothing to do with warm start problems.

I think the CTS (Coolant Temperature Sensor) is where you should start.
Forum: C4 General Discussion 07-28-2017, 03:25 AM
Replies: 4
Views: 279
Posted By Cliff Harris
I looked at the ECM code and it sets the startup...

I looked at the ECM code and it sets the startup idle to 1200 RPM (in my car). That then decays down to the specified idle as the coolant warms up. When the coolant is hot, the decay to lower idle...
Forum: C4 Tech/Performance 07-28-2017, 03:03 AM
Replies: 10
Views: 517
Posted By Cliff Harris
To clarify the vacuum line configuration, one...

To clarify the vacuum line configuration, one vacuum line comes from the bottom of the throttle body. The other vacuum line goes to the EGR valve. This is kind of an exploded view of the vacuum line:...
Forum: C4 Tech/Performance 07-26-2017, 02:27 AM
Replies: 7
Views: 429
Posted By Cliff Harris
This should be enough to get your hatch open: ...

This should be enough to get your hatch open:

http://www.misterpeachy.com/VettePics/Hatch_Release_Cable.JPG
Forum: C4 General Discussion 07-25-2017, 04:40 AM
Replies: 7
Views: 351
Posted By Cliff Harris
That's supply and demand. The supply has...

That's supply and demand. The supply has essentially gone to zero, so somebody has taken advantage of that and drastically increased the price. Richard Newton died recently, so that makes the books...
Forum: C4 General Discussion 07-25-2017, 04:34 AM
Replies: 6
Views: 629
Posted By Cliff Harris
The ECM has a "pullup" resistor on the MAF signal...

The ECM has a "pullup" resistor on the MAF signal wire (you can see it in the second diagram to the right of the "B12" ECM pin label. If there is a loss of connectivity between the MAF and the ECM,...
Forum: C4 General Discussion 07-25-2017, 03:41 AM
Replies: 18
Views: 685
Posted By Cliff Harris
I have maintained for years that there is a...

I have maintained for years that there is a problem with the way the gears mesh on my driver's side headlight. The gears have stripped out twice, while the passenger side has been perfect for 31...
Showing results 1 to 25 of 280

 
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