Exhaust changes causes problems

[ShawnZR-1]

Roger, if you need a hand, let me know. I'm in north Georgia but I'm always up for traveling to help out a fellow ZRoner!

I have DIACOM and can scan your car if need be.

[ShawnZR-1]

Roger, if you need a hand, let me know. I'm in north Georgia but I'm always up for traveling to help out a fellow ZRoner!

I have DIACOM and can scan your car if need be.

[bradslt5]

just thought to share . thats a really cool offer you made to him. makes me glad to see so many that go out of their way to help others here now if the world would only do the same.....................

[rogerzr1]

Originally Posted by ShawnZR-1

Roger, if you need a hand, let me know. I'm in north Georgia but I'm always up for traveling to help out a fellow ZRoner!

I have DIACOM and can scan your car if need be.

Shawn, thanks. I was hoping that you or Steve had a scan tool and would offer to help.

The first thing I am going to do is replace the o2 sensor. If this doesn't fix the car, I am lost and would love some help. I will drive to you if that works better, but lets see what the o2 change does.

Even if the o2 fixes the problem, I still would like to meet you and Steve.

[Tyler Townsley]

I posted this in another thread but it is some simple things any owner can do to help people trying to do troubleshooting from afar.

1. Compression check.
2. Run the car, park it and look at the plugs they should be uniform in appearance if not then chase fuel/spark on that cyl.
3.Take a good known plug and one cyl at a time unplug the wire, plug in the plug, lay it on the plenum and start the car. The spark should be the same on every cyl if not then you know which coil pack/wire to chase for problems.
4. There is a DIS checker and should you suspect the dis of falling apart I can lend it to you. You need some kind of a scope to look at the signals to verify its falling apart.
5. If you pull the plenum then you can check the injectors by pulling fuel rail up, crank the car and look at the spray pattern.
6. If you have a suspect cyl you can eliminate spark with step 2 and check fuel by swaping injectors from cyl to cyl, this requires pulling the plenum but you get pretty good at in with practice.
7. Listen for the vacuum pump at the left front of the car. You should hear it cycle for a couple of seconds when the key is first turned on the go quiet for at least 5-10 minutes. Both failing to pull the vacuum, on start and an continuly cycling pump signal problems that will cause what you describe.

Let us know what you find.

Tyler

[ShawnZR-1]

Originally Posted by rogerzr1

Shawn, thanks. I was hoping that you or Steve had a scan tool and would offer to help.

The first thing I am going to do is replace the o2 sensor. If this doesn't fix the car, I am lost and would love some help. I will drive to you if that works better, but lets see what the o2 change does.

Even if the o2 fixes the problem, I still would like to meet you and Steve.

Oh, I bet I can sucker Steve into a mini-gathering!

Just let us know what the outcome is on the O2 sensor change.

[rogerzr1]

Changed both o2 sensors. After I changed the left one(couldn't get to the right one) the car drove pretty good. I drove it one night I guess the temperature was around low 40's. The reason I mention this is that I have now changed the right side o2 sensor and the car is still having problems. I drove it today, temp around upper 50's and it hesitated at WOTH about 20% of the time. It is driving better than before I changed the o2 sensors, but not as well as it drove before the right o2 sensor.

Could I be looking at something that is related to outside temp or am I just grasping at straws.

Any body have any dynamite?

[bradslt5]

roger , let me ask a couple of ?s when you turn the key to on not star do you here the motor for the vaccume pump come on in thge right front up by the headlight . does it go on and shut off or does it cycle on and off?. did you ever get the helm manual yet ? if not you really need one it would help you alot in deducing your problems .pm me if you still need help and i will seeif i i can walk you thru some ideas to help brad

[rogerzr1]

Originally Posted by bradslt5

roger , let me ask a couple of ?s when you turn the key to on not star do you here the motor for the vaccume pump come on in thge right front up by the headlight . does it go on and shut off or does it cycle on and off?. did you ever get the helm manual yet ? if not you really need one it would help you alot in deducing your problems .pm me if you still need help and i will seeif i i can walk you thru some ideas to help brad

The vaccume comes on and then goes off. I am not sure about it cycling on and off, I will check. I do have the Helms manual.

I never checked the fuel filter. Any chance there is something with that?

[bradslt5]

could be . have you cked your fuel pressure? when i get a car the first thing i do is change all filters and fluids then i know everything is fresh . does it stumble when you first floor it or towards the top end of the rpm scale ?