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Search: Posts Made By: John Robinson
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Forum: C7 General Discussion
01-17-2013, 07:33 PM
Replies: 254
Views: 31,519
Posted By John Robinson

I think we have a group of people who would...

I think we have a group of people who would resist change at any cost when it comes to a Corvette. All this boo hooing the rear design etc etc. Gee I remember when My dad and I had a new 60 vette...
Forum: C4 Tech/Performance
12-20-2012, 05:21 PM
Replies: 23
Views: 1,879
Posted By John Robinson

Stop before you do anything else. The first...

Stop before you do anything else. The first thing to learn is that the grounds are the lifeblood of the Corvette. Dirty grounds will cause the ECM to go crazy. Since the car sat outside for years...
Forum: C4 Tech/Performance
12-19-2012, 06:24 AM
Replies: 7
Views: 738
Posted By John Robinson

You might get a set of these bolt extractors ...

You might get a set of these bolt extractors

http://www.irwin.com/tools/screw-bolt-extractors/5-pc-bolt-grip-base-set

I got mine at Advance Auto. They grip so tight that I bent a 3/8' break...
Forum: C4 General Discussion
11-06-2012, 04:37 AM
Replies: 18
Views: 11,508
Posted By John Robinson

DO NOT drive the car or run it in the garage. I...

DO NOT drive the car or run it in the garage. I had the same mystery gas odor. Here is what happened. One day after filling the car up the night before I went out and started it up to go...
Forum: C4 Tech/Performance
08-17-2012, 01:19 AM
Replies: 26
Views: 6,511
Posted By John Robinson

[EMAIL="http://i285.photobucket.com/albums/ll72/Jo...

[EMAIL="http://i285.photobucket.com/albums/ll72/John-68/th_Corvettegroundlocations.jpg...
Forum: C4 Tech/Performance
08-17-2012, 01:10 AM
Replies: 26
Views: 6,511
Posted By John Robinson

From what I have read it sounds like the starter...

From what I have read it sounds like the starter is trying to engage. If as you say the voltage is good in the battery and the alternator is working then the most likely thing is you do not have a...
Forum: C4 Tech/Performance
08-14-2012, 02:24 AM
Replies: 26
Views: 6,511
Posted By John Robinson

I totally agree with this advice and would add...

I totally agree with this advice and would add that as long as you are there also check the coil heat sink grease.

I just went through having bad signals and the tachometer needle jumping around...
Forum: C4 Tech/Performance
08-07-2012, 03:01 AM
Replies: 26
Views: 6,511
Posted By John Robinson

On my 93 LT1 I only have two O2 sensors. I...

On my 93 LT1 I only have two O2 sensors. I replaced the the right side sensor by soaking it in penetrating fluid. Then using a long extension and a little imagination I was able to come down from...
Forum: C4 Tech/Performance
08-05-2012, 06:08 PM
Replies: 8
Views: 707
Posted By John Robinson

You can do what I did for the wires that touched...

You can do what I did for the wires that touched or were to close together. I took some rubber hose that was fairly stiff and drilled holes through it and then I cut a slot so the wires could be...
Forum: C4 Tech/Performance
08-05-2012, 01:09 PM
Replies: 8
Views: 707
Posted By John Robinson

To make sure the wires are on the opti tight put...

To make sure the wires are on the opti tight put a little bit of dielectric grease on the pin that goes into the plug wire. Same for the plugs. Because the #8 plug the passenger side back plug is...
Forum: C4 Tech/Performance
08-02-2012, 12:52 PM
Replies: 35
Views: 1,947
Posted By John Robinson

Try getting out of the box your in and look at...

Try getting out of the box your in and look at this box. The TPS sends signals to the ECM about throttle openings etc. And the signal goes through the ground wire. Bad or confusing signal to the...
Forum: C4 Tech/Performance
07-26-2012, 11:58 AM
Replies: 10
Views: 905
Posted By John Robinson

Since you brought it up here is how to figure the...

Since you brought it up here is how to figure the tire diameter




2X section width multiplied by the Aspect ratio plus the rim diameter divided by 2540 will give you the overall diameter...
Forum: C4 Tech/Performance
07-26-2012, 05:22 AM
Replies: 10
Views: 905
Posted By John Robinson

Here is the formula for figuring what the rpm...

Here is the formula for figuring what the rpm would be with different gear ratios,

Here is the formula for figuring the rpm for the different gear ratio

RPM=mph x final drive ratio x gear ratio...
Forum: C4 Tech/Performance
07-24-2012, 04:30 PM
Replies: 11
Views: 8,343
Posted By John Robinson

How are you reading the codes? If the code has...

How are you reading the codes? If the code has an H before it that means it is a history code. I suppose it is possible for that code to be from another car that was not removed when it was re...
Forum: C4 Tech/Performance
07-24-2012, 08:11 AM
Replies: 4
Views: 1,131
Posted By John Robinson

When you start the car it is in open loop. That...

When you start the car it is in open loop. That means the ECM is taking it's information from the O2 sensor to adjust the fuel delivery. When it goes into closed loop the ECM then switches to...
Forum: C4 Tech/Performance
07-24-2012, 07:55 AM
Replies: 11
Views: 8,343
Posted By John Robinson

Code 46 in the Chilton manual says. Personal...

Code 46 in the Chilton manual says. Personal Automotive Security System (Pass Key II) circuit or Power Steering Pressure Switch (PSPS) circuit.

Before you do all that work on the vats you might...
Forum: C4 Tech/Performance
07-23-2012, 06:37 PM
Replies: 14
Views: 17,652
Posted By John Robinson

The intake manifold will leak at the front and...

The intake manifold will leak at the front and back in the valleys. The front leak will make you think it is the timing cover etc. The rear leak will run off the cross member and look like a rear...
Forum: C4 Tech/Performance
07-23-2012, 09:11 AM
Replies: 13
Views: 939
Posted By John Robinson

You need to get one of those infrared temperature...

You need to get one of those infrared temperature readers. With the car to temperature then use the temperature reader to check the radiator at different spots. For instance each corner and across...
Forum: C4 Tech/Performance
07-19-2012, 08:20 AM
Replies: 24
Views: 16,372
Posted By John Robinson

I replaced the antenna about 6 years ago and then...

I replaced the antenna about 6 years ago and then a couple of years ago it started to do what yours is doing by not going all the way down. I have done nothing about it and most people think it is...
Forum: C4 Tech/Performance
07-19-2012, 08:12 AM
Replies: 17
Views: 1,020
Posted By John Robinson

If everything works then don't worry about it. ...

If everything works then don't worry about it. It is not uncommon for the wiring harness to have extra pigtails for accessories not installed on your car. It was cheaper to make one generic harness...
Forum: C4 Tech/Performance
07-19-2012, 04:30 AM
Replies: 5
Views: 1,612
Posted By John Robinson

I can not figure out how to send a copy of the...

I can not figure out how to send a copy of the FSM sheets for adjusting the ABS/ASR cables. If you have a FSM for a 93 look in section 5E2-131 for the procedure to adjust the shift points on the...
Forum: C4 Tech/Performance
07-18-2012, 07:52 AM
Replies: 10
Views: 1,058
Posted By John Robinson

Tps

Yesterday I had a problem with the car not restarting after it was run 6 miles in 99 degree heat and sat for 3 hours soaking up the heat under the hood and the sun on it. It gave me a service engine...
Forum: C4 General Discussion
07-18-2012, 06:02 AM
Replies: 21
Views: 1,436
Posted By John Robinson

What I don't see you have done is to clean all...

What I don't see you have done is to clean all the grounds. Nothing happens with these cars if the grounds are bad and there are several of them.

Don't forget to check the fuses.
Forum: C4 Tech/Performance
07-18-2012, 05:51 AM
Replies: 9
Views: 2,372
Posted By John Robinson

I second this information. My TPS went bad and...

I second this information. My TPS went bad and did this. Unfortunately I bought an ECM that I didn't need. My mechanic finally did what you did and sprayed some fluid into the TB and it fired...
Forum: C4 Tech/Performance
11-11-2008, 07:36 PM
Replies: 17
Views: 1,418
Posted By John Robinson

If you have not replaced the plugs and wires I...

If you have not replaced the plugs and wires I would guess that what you are getting is a misfire from the spark jumping through the wires. Get it in a very dark place and start the engine and watch...
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