89GTA5spd

My '89 GTA stumbles now under full throttle and almost full throttle situations. It will hesitate, then go.. and hesitate.. then go. It doesn't do it sometimes.. but it seems like most of the times. Anybody have any idea what it might be?

I have pretty new wires/plugs/cap/rotor.. i was thinking it may be my coil..? I checked my TPS, and that seems to work fine (it is at correct voltage and moves up to 5V fine.

.. oh, it's a 5speed with a TPI 305 and 90,000 miles.

89GTA5spd

rondubbs

could be a clogged fuel filter or injector.

89GTA5spd

I replaced the fuel filter 6 or 7 thousand miles ago. Is there any way to check the fuel injectors?

Monkie

I had (have I meant) the same exact problem! When I give it WOT it will do exactly what yours does. I asked on here earlier about it and someone said it was an ignition problem. I think they were right because this is what I think happened...Ok I was in front of my friends house about to leave and I went to start my car and I got an idea. Ive got a manual so you have to push the clutch in or the car wont even start. I had never tried to start it without pushing it in before. So I thought what the hell, and I tried it. the only thing that happened was my temp or volt gauge went sky rocket. So I was like "Oh **** that didnt work!" so I stated it up (the right way!) and went home. But on the way home I gave it WOT and guess what happened. I dont know what it is but thats what happened so does anyone have any sugestions. All I can think is it might be the coil. ????????????????

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1992 Camaro RS 3.1L
T5 Manual 5 speed
Open Air Intake
Z-28 Exhaust

89GTA5spd

I guess I am going to order an msd coil from summit today, and hope that fixes it. I'll put it on the board if it does. A bad coil would be a lot better than a bad injector.

MY87ROC

it could be related to your other post about your egr and possible vaccume leak at egr vaccume tube connection

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TPIS airfoil,relocated MAT,AFPR,TB h2o bypass
otherwise stock 5.0TPI
700r4, 9 bolt 3.23 g92 axle

89GTA5spd

I think you may be right. I took off my coil today and tested the resistance as per my chilton's manual instructions. All the tests were fine. I checked mt pickup as well and got 833 ohms of resistance.. which the manual said was in spec.

Does anyone know if the egr vacuum tube goes into the closest or furthest connection in the connector that connects to the egr soloniod? I have a feeling mine might be switched..

I also have a feeling that something is wrong with my egr because in the morning my car almost dies when it is cold (idles @ 400-500 rpm... then goes up to 1500.. then back down again until it is a little warm) which i have heard is a sign of a fault egr.

IrocManiac

Ignition or your Catalytic Converter. That is where I would start.

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TPI 305,
Gutted airboxes,
gutted MAF,
K&N filters,
Corvette Servo.
14.9@93mph

"Speed kills, wanna live forever, drive a Ford."

MY87ROC

the vaccume line from the egr goes to the one closer to the solinoid the other goes to the bottom of the throttle body and then to the cannister. i just had egr problems to. car idled ok but ran rich and power was way down at WOT and code 32 sometimes, about 5 seconds after startup turned out to be temp sensor from egr to ecm since parts were 13 years old i replaced egr, selinoid and temp sensor along with all vaccume hoses, made a world of differance from startup to idle to WOT and fuel mileage was up

------------------
TPIS airfoil,relocated MAT,AFPR,TB h2o bypass
otherwise stock 5.0TPI
700r4, 9 bolt 3.23 g92 axle

[This message has been edited by MY87ROC (edited November 04, 2000).]

Monkie

Ok we've figured out that it is an ignition problem. But an ignition problem doesnt really narrow it down. What is it? The coil, wires, distributors, or what? My EGR valve is bad so could it be that? And how much does an EGR valve cost? Thanks!

------------------
1992 Camaro RS 3.1L
T5 Manual 5 speed
Open Air Intake
Z-28 Exhaust

MY87ROC

hey monkie if you get an ac delco egr they go around $50 thats what i paid for mine for a 5.0 tpi

------------------
TPIS airfoil,relocated MAT,AFPR,TB h2o bypass
otherwise stock 5.0TPI
700r4, 9 bolt 3.23 g92 axle

89GTA5spd

MY87IROC,

You had fuel mileage problems that were solved by replacing the egr? I have been having some really poor fuel mileage lately. I guess i will run out and check the egr and then if it doesn't look ok bite the bullet and replace the solenoid and valve..

You mentioned a temp. sensor from the egr to ecm.. I have never heard of a temp sensor for the egr valve. Where was it located?

Thanks for the help.

89GTA5spd

Monkie

Thats what I thought. But I went to GM and asked them how much one for my car would cost and they said it would be $400!!! Thats is crazy isnt it!?

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1992 Camaro RS 3.1L
T5 Manual 5 speed
Open Air Intake
Z-28 Exhaust

Monkie

MY87ROC where did you get it from??? Would they have one for a 92 3.1L maro?

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1992 Camaro RS 3.1L
T5 Manual 5 speed
Open Air Intake
Z-28 Exhaust

MY87ROC

MONKIE
yeah that don't sound right at all,i heard there are different types but i can check on mon. and get back to you. the parts shop here deals with ac delco parts mostly so i will see what they say.

------------------
TPIS airfoil,relocated MAT,AFPR,TB h2o bypass
otherwise stock 5.0TPI
700r4, 9 bolt 3.23 g92 axle

MY87ROC

89GTA5SD
It screws into the base of the egr valve and a wire comes out and goes to a connection that was somewhere near the pass side of the dist. its hard to see until you remove the plenum which needs to be removed anyway to replace the egr valve. the temp sensor was about $10, egr $50 +-, and egr selenoid was about $30 all ac delco brand.

Monkie

Ok thanks man I would appreciate that alot!



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1992 Camaro RS 3.1L
T5 Manual 5 speed
Open Air Intake
Z-28 Exhaust

BlackBird305

My 91 Bird did the same thing...i was at a light and when i punched it it stumbled...i figured it was something in the ingnition so i checked it all out and everyhting seemed ok...come to figure out it was the EGR because i experienced a lot of low-speed low-RPM detanation....check the EGR...if u have a Chiltons mannual it tells u how ot test the valve

Monkie

Oh I know its my EGR valve, mine has been bad every since I bout my car. Im getting the Blaster 2 coil tomorrow and then gettin the EGR valve later.

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1992 Camaro RS 3.1L
T5 Manual 5 speed
Open Air Intake
Z-28 Exhaust

MY87ROC

MONKIE
I think i have some bad news
your EGR is a digital circuit which
means $. have you checked for an open
or short to ground in EGR valve circuit
double check all wires and connections
this means your EGR is controled
electronically through your ECM
instead of the intake manifold vacuum
this included all 90 and later 3.1 v6.
other wise the best i found is $315.43
total includes nevada sales tax.
sorry the news was not better


------------------
TPIS airfoil,relocated MAT,AFPR,TB h2o bypass
otherwise stock 5.0TPI
700r4, 9 bolt 3.23 g92 axle

Monkie

MY87ROC

Damn that is some bad news . So I should check all the connections? I hope thats just the problem. I cant fork out $315 any time soon. I will check the connections tomorrow. After I check all the connections how do I test it and see if that was the problem?

Oh and thanks again for checking for me.

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1992 Camaro RS 3.1L
T5 Manual 5 speed
Open Air Intake
Z-28 Exhaust

Monkie

MY87ROC

I found this on wrenchead.com...

ACDelco

[EGR Valve] RS Listing $268.22

BORG WARNER

[EGR Valve & Gasket] OE # 17090077/1147; 17112652; Match # on OE Unit $211.18

STANDARD

[EGR Valve & Gasket] w/Gskt.; OE # 17091147/17112652 $236.00


Which one do you think I should get?
Thanks man!

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1992 Camaro RS 3.1L
T5 Manual 5 speed
Open Air Intake
Z-28 Exhaust

MY87ROC

MONKIE
From what i see there are three wires that go to the ECM from the EGR, red, light blue, and brown these are three ECM controlled solenoids the red is #3, the light blue is #1 and the brown is #2 and there is a common powwer supply pink/black. but i think since these 3 wires connect to the ECM maybe they should be unpluged from the ECM before testing because there could be risk of damaging ECM. i wish i could help somemore but this is starting to go beyond my knowledge of electronics maybe someone else here might now more about these things.
but if i had to replace the EGR i would get the AC Delco one. sorry i could'nt be more help.

------------------
TPIS airfoil,relocated MAT,AFPR,TB h2o bypass
otherwise stock 5.0TPI
700r4, 9 bolt 3.23 g92 axle

Monkie

MY87ROC

No man, you were a ton of help! I didnt get to check the wires today cause I was gona about all day and plus it was raining so I didnt bother with it. Im just gonna replace the EGR. And I agree with you, Im gonna go with the AC delco one. THANKS FOR THE HELP!

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1992 Camaro RS 3.1L
T5 Manual 5 speed
Open Air Intake
Z-28 Exhaust