Why is that when i'm crusin around 45mph and 1500 Rpm my car starts to jerk. Is there something loose or what.... this is in my 92 3.1l v6??

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92 Camaro 305 TBI. Everything stock so far except a shift kit.

Future mods. Spark plug wires and plugs, tint, Cutting off cat and new 3inch pipes. Maybe putting 2 glass paks for effect. any other advise on getting to 300+ HP would be appreciated. Thanks

 

Sounds like the tranny is swithing back and forth from 3rd and 4th gear. There's always been that fine line with GM trannies. Either that or the torque conv. is locking and unlocking. Try cruising at 45 with the tranny in 3rd. If it don't do it then it's the 3rd to 4th problem. Not really a problem, just a characteristic. Does the car sputter when coming to a stop? My 87 Celebrity did that for a while, then it would die, kinda like a manual trans. I guess the switch for the lock up on the converter was keeping it locked. I dunno if this relates to your prob., but it might. My point is, the lock up switch thingy could be messed up. HEHE!!!!

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92 RS w/t-tops 305 TBI Auto.
170K miles and don't burn a drop o'oil
-K&N Truck filter #1500 w, open ele.
air cleaner
-Dynomax 2 1/2" cat-back
-B&M TransPak
-Jet Stage2 Chip
-180* T-Stat w/ 185* Fan Switch
-JVC CD--Alpine speakers & 4ch. amp
Rockford 2ch. to 2 MTX 12" subs

 

Disconnect the EGR valve and see if it still does it.

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ASE Mechanic/Machinist/Smog Tech

1999 NBM Trans Am
1986 Chevy 3/4 ton pick up
1981 corvette
1995 Kawi ZX6R
and 2 POS commuters...

R.I.P. #3
"He can see air"

 

I drove with it in 3rd and it didnt seem to do it.. but when i pressed and released the accelerater it jerk but i think thats becuase of high rpm's. ALso why would i Disconnect the EGR valve ???

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92 Camaro 305 TBI. Everything stock so far except a shift kit.

Future mods. Spark plug wires and plugs, tint, Cutting off cat and new 3inch pipes. Maybe putting 2 glass paks for effect. any other advise on getting to 300+ HP would be appreciated. Thanks

 

Its tough to tell what kind of jerk the car is doing over the internet, but an EGR valve getting vac. at the wrong time or in the wrong amount will cause a jerk. This will seem quite noticable.

How are the wires, etc??

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ASE Mechanic/Machinist/Smog Tech

1999 NBM Trans Am
1986 Chevy 3/4 ton pick up
1981 corvette
1995 Kawi ZX6R
and 2 POS commuters...

R.I.P. #3
"He can see air"

[This message has been edited by Engineboy (edited June 13, 2001).]

 

I read somewhere not to mess with the EGR valve on my TPI 3.1L??? should I still unhook it...

 

I'm not suggesting un-hooking it permanately, just to drive around and see if it cures the problem.

This will tell you if the prob. is in the EGR system......

Process of elimination my friend.

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ASE Mechanic/Machinist/Smog Tech

1999 NBM Trans Am
1986 Chevy 3/4 ton pick up
1981 corvette
1995 Kawi ZX6R
and 2 POS commuters...

R.I.P. #3
"He can see air"

 

Ok I'll do that and see what happens.. Thanks... BTW on my engine... Becuase I haven't looked under the hood lately.. is the EGR valve located at the bottom of the engine?

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92 Camaro 305 TBI Automatic. Everything stock so far except a shift kit.

Future mods. Spark plug wires and plugs, tint, new 3inch pipes. Maybe putting 2 glass paks for effect. any other advise on getting to 300+ HP would be appreciated. Thanks

 

The EGR valve should be visable from the top, somewhere on the intake manifold.

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ASE Mechanic/Machinist/Smog Tech

1999 NBM Trans Am
1986 Chevy 3/4 ton pick up
1981 corvette
1995 Kawi ZX6R
and 2 POS commuters...

R.I.P. #3
"He can see air"

 

I'll second Engineboy's diagnosis on the EGR. Even before the computers, EGR was notorious for causing that uneven feeling at steady speeds. Disconnecting it solved many drivability problems.

However, disconnecting the EGR in your car (or any other computer-controlled engine) would produce massive pinging and the idiot computer will not automatically richen the mixture to compensate. Still, it ought to run a little smoother.

The EGR valve has a large brass-colored top with a vacuum hose coming out of it. As Engineboy said, it is on top of the engine. It may be located off to one side near one of the exhaust manifolds. I'm not familiar with the 3.1 V6 but most EGR valves are that way.

 

Thanks Ill do that... Im swithing between cars right now so I can disconnect it at the moment... But I will... Also I was driving in D(3rd right) and it was still jerking back and forth...

 

Do u think a bad motor or trans mount cause his problem?

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86 Tramaro 90% Trans Am/ 10% IROC/Z (nose, hood,& fenders)
Trans Am Mods as of 1/10/01
3inch
T.E.S/Flowmaster setup,gutted cat,gutted maf,relocated mat,373 gears,upgraded factory chip,255 lph walpro f/pump & throttle body coolant bypass
njdaewoo@excite.com
New mods as of 6/10/01:
383sb engine
Comp Cam Xteme XR264hr-12
smog pump by-pass

 

Ive replaced the trans mount twice.. I know what that feels like when its broke. May be the motor mount though...Thx