90 Q shaking.....

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pito11213
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Well guys. Yesturday I turned on my car to go home and noticed that they car had an actual shake. I mean you could physically feel the car rocking side to side. Well before this happend I put in a can of bg from the dealer in the gas tank. So when this happend I put in another bottle.

Then today I cleaned out the throttle body with cleaner and sufficed to say there was plenty of dirt in there. I cleaned it then started it (after a few tries) and the shake is still there. I took it to my mechanic and he drove (he hates the fact that it starts in 2nd gear) and says that it is possibly a catalytic converter going bad. When you hit the gas and are next to a parked object you hear some kind of a weird noise almost like something trying to push through a small space and sounding like air.

I am going to try to save the money to pay the dealer the 97.50 do do a full diagnostic. I already know the obvious such as valve cover gaskets and oh yeah the blue smoke out of the exhaust.

Do you guys have any suggestions or thoughts/insight as to what this is? Does my mechanic make a valid point about the cat? I know I do have some oil and the exhasut tail pipe


Q45tech
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At idle a melted cat wouldn't create enough back pressure to affect idle. Injector, plugs, Maf connection, slipped timing by 1 tooth? Power balance test will tell you where to look.

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PalmerWMD
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Q45tech wrote:At idle a melted cat wouldn't create enough back pressure to affect idle. Injector, plugs, Maf connection, slipped timing by 1 tooth? Power balance test will tell you where to look.


I highly recommend having the diagnostic done to find out if yuou dont want this problem to stay around too long.

Fred..:)

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elwesso
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Wiggle the MAF connector.... Then start looking at the injectors...

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pito11213
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Well as far as the rpm gauge on the dash my idle doesn't move. But you feel the car shake. When you hit the accelarator you can feel some vibration through the car. I am going to make the appointment with the dealer sometime next week.

Q45 tech... is the power balance test included with the consult/diagnostic.

I want this diagnostic before I go doing stuff.

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PalmerWMD
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Now that I think about it some more...

I have expereinced this symptom before, in a 92Q.Was due to Faulty injectors.

Fred...:)

Edited for typos

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pito11213
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I am suspecting that as well Fred...

I will have to take it to the dealer to find out exactly which one since my mechanic's shop is closed since they are rebuilding the gas station near it.

I hope it is just one and not two or just one and the others waiting to die also.

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Jeff Williams
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If they have to replace one, I would seriously consider replacing all 8. Unless they can get to the bad one easily, they will be removing the plenum, and it is a good time to get them all replaced. The labor for the other 7 is relatively free, and in some cases, is free. They could do a plenum and runner cleaning, even replace the knock sensors, while they are in there. You don't want to pay the labor cost more than once, if you can swing the extra material costs.

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pito11213
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Well Jeff that sounds good but....

At $150 a piece for the injectors and then $100 a piece for the knock sensors that is just not in the budget.

How much do you guys pay for plenum removal?

I am going to let the fuel injector cleaner run through then fill up again with techron and see if that makes any difference. The previous owner used to put in injector cleaner (techron) and used Georgia gas.

I also am really leaning towards spark plugs as since the valve covers have been leaking for some time the spark plugs may be fouled by now.

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PalmerWMD
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There is a good shop in NJ:Here might be wortha trip.http://nissaninfiniticlub.net/...25202

Fred..:)

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pito11213
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I forgot about keith

I will have to give him a call to get a quote from him to check out the car.

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sijoko
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Did this happen right after you put in the can of BG?

-sijoko

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pito11213
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No it didnt happen right away. I was leaving work and when I started it, let it warm up and pulled off, I felt the shake. I am not blaming this in no way to the BG.

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Can you do a OHM check with a multimeter? Do a search to see how...

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elwesso
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IF your unsure I will post a writeup on how to ohm the injecotrs from the harness....

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pito11213
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I would definately appreciate that write up wes whether it is here or the org which by the way I like also.

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PalmerWMD
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pito11213 wrote:I would definately appreciate that write up wes whether it is here or the org which by the way I like also.


Its the Nico Q45 portal.

Fred..:thumbup

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elwesso
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Alright, I will do that!!! I am battling another problem (sand in the interior of the Q, LONG story)... But I'll get to that.....

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pito11213
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Well here is something to add to the symptom list

I noticedwhile I was parked next to a barricade when the car is in drive and I tap the gas and move the car there is a sound as if there is air escaping from the exhaust. When I put the car in park and tap the gas I dont really hear it. Could you guys please give some input as to what my mechanic said about the cats being clogged with oil. I can hear that sound every time I hit the gas and I pass by something.

Dennis please put more possible input to this theory. Does it have validation.

squeefoo
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Pito, can you stick your head under there while it does that?Somebody you trust with their foot on the brake in drive?Loose OX sensor? bad exh. man. doughnut? I would think your Cats would have gotten so hot you'd notice the smell of something melting. Injector locked open?

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pito11213
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I guess I am just going to have to go to the dealer to find out what is going on and pay the $100 for them to give it a run through.

I am also going to give Keith Vanmeter a call today to see what he is going to charge to look at it. It many not be cost effective to to go all the way out to jersey and end up spending more.

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pito11213
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How does a bad spark plug sound to you guys given my symptoms

There is oil in the spark plug wells due to leaky valve covers

This has been a problem for atleast the last 2 years. Maybe the oil finally leaked down to the spark plug tip.


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pito11213
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Well hopefully after I change my spark plugs and fuel filter that will help the Q. I still have to ohm the injectors though

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redmanfx
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Oil on the sparkplug could lead to a missfire and can be a cause of problems. A new valve cover gasket can fix the oil on the plugs along with checking to make sure you have good rubber spark plug booty hoogie bobbers.

Oil on the plugs doesn't always lead to missfires but it can if negleted long enough.

red

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pito11213
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Well hey at minimum it has been 2 years that the valve covers have leaked. Who knows how long they have been leaking. I think maybe on a weekend I will take Wes's advice and try the valve cover seals my self. If not I will ask my mechanic to give me a good price.What is the going rate that you guys pay anyway for that job.

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elwesso
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Im pretty sure dennis has said they charge $500 for a reseal...

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pito11213
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That means my mechanic will do it cheaper. The only reason why I dont attempt to much on this car is1. A bit more complex than most cars2. Space available to work

Wes you obviously have a large garage where you might as well open up your own little shop.

Working in a parking lot has it downsidesIE: extremely dirty ground, pee smell (common to the ghetto), spilled oil and antifreeze from the other moron that didnt have a spill bucket.

spark plug booty hoogie bobbers. What the hell are these?


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