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Apr 14, 2004 | 11:12 PM

WhiteThunderZ28

Thread Starter

Staging Lane

Joined: Feb 2003

Posts: 78

Likes: 0

From: Your girls house, she is on my "D", Wisconsin

Need some help here!

Maybe somebody can help me with a problem that my 94 LT1 Z28 decided to have...

After I got back from I parked my car on the street cause I was going somewhere else later on....

Well I jump in my car and started her up and it had this weird vibration that rattled my interior while the engine was running, I go to turn on the heat and everything in my car is vibrating worse and the it sounded like it was going to quit.....
The exhaust sound changed from sound like a stock V8 to a cammed V8, so I turned the heat off but I still got a vibration like the first time... The idle hovers at 500- 650rpms but mainly at 500 in gear and park, I know its supposed to be around 700 or so, so I gradualy reved the rpms up and the vibrations was still there

Well I put my car into gear and the vibration has gotten worse and then turned on the heat and everything was rattling more worse than before...

So I listened to my exhaust and it sounded like I was running on 7 cylinders but when I drove it I still had the power of all 8 cylinders and no vibrations.... There are no vaccum leaks what so ever....What gives???

I have come down with some thoughts in what might be wrong...
1. Ignition Coil
2. Ignition Module
3. Plug wires
4. Opti
5. o2 Sensors

Can anybody help me???

Thanks

Apr 15, 2004 | 01:23 AM

Vendetta

TECH Senior Member

Joined: Jun 2003

Posts: 9,339

Likes: 3

From: NYC metro area

#1 check your wires to make sure none are fried.
#2 opti...

sounds a lot like a bad opti to me. how many miles are on yours? could also be a bad O2...

don't worry, it's not that big of a problem.

Apr 15, 2004 | 08:48 AM

DukesI3

Staging Lane

Joined: Apr 2004

Posts: 66

Likes: 0

From: OOOOHIO

i know this probably isnt it.... but ive heard that a descreened maf will sometimes cause this if the engine doesnt adapt correctly to it..??? i have no idea but ive wondered if this was true.

Apr 15, 2004 | 10:38 AM

bowtie9696

Staging Lane

Joined: Mar 2004

Posts: 76

Likes: 0

From: MI

Sounds like you have a dead hole. Like enisguy said, check to see if you are getting spark to each cylinder. Are you throwing any codes. I had a similiar problem when I descreened my MAF. Something must have got in my air intake and damaged one of my resistors in the MAF. It threw a code for this and ran like crap. It is really easy to test the MAF with a voltmeter is this is the case.

Apr 15, 2004 | 10:48 AM

-PEPE-

11 Second Club

iTrader: (10)

Joined: Jun 2003

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Could be a number of things, I'd definitely do what they stated above first, check all your wires are good, not burnt, plugged in, etc. Then plugs, coil & 02 sensors. Autozone will scan it for free and I'm sure you have an SES light, probably blinking (multi-eng-misfire). Optis are evil sure but a lot of times it's something else. I just went through 2 weeks of diagnosing mine running crappy and turns out it was my drivers side (3-week old) 02 sensors...they don't like race-gas...well lesson learned I really just didn't know any better, but it's runs like a champ again, all it was. Codes were P1133 & PO132 I think for Bank1 Sensor 1 (drivers side 02) faulty. Good luck, let us know what you find, helps us all diagnose.

Apr 15, 2004 | 04:47 PM

WhiteThunderZ28

Thread Starter

Staging Lane

Joined: Feb 2003

Posts: 78

Likes: 0

From: Your girls house, she is on my "D", Wisconsin

Well my # 8 wire was ripped before (the car still ran normal) so I taped it with electrical tape and it still ran fine... but ill check to see if the wires are fireing... Ill let ya know what i find more