GrandAmGT.com Forum
http://www.pfyc.com GrandAmGT.com Premium Memership Signup
RedlineGoods.com   

Go Back   GrandAmGT.com Forum > GAGT - Technical - Sponsored by www.MilzyMotorSports.com > Technical Q&A

Reply
 
Thread Tools Display Modes
Old 12-26-2012, 03:15 AM   #1
over's ga
GAGT - Member
 
AKA: Jim
Join Date: Jul 2012
Location: PHX
Posts: 47
Vehicle: '02 Alero, 3500 swap
over's ga Gettin' there
Question 02 Alero V6 mystery engine problem (3500)

UPDATE/ SOLVED . IT WAS CATALYTIC CONVERTER.......
-----------------------------------------------------
...mystery to me, probably just a sensor or something obvious. Please help with diagnosis

3500 engine swap just done but I don't think issue is with swap.

(NO Check Engine Light lit)

Problem. low power driving, runs rough at times, slow response with rev limiter like cut out while revving in neutral, no service engine light (light works) car starts right up and idles normal, starts to idle a little rough after running for a while, driving it has very little power and won't rev and shifts erratically

CAR HISTORY:
2002 70,000mi. Alero, bought cheap with seized/rusted tight 3400, sat long time with water in cylinders, gas was stale (may of been sitting for 3 + years!)

-Did '06 low mi. Malibu Max 3500 swap with Milzy kit (just basic swap, re-used 3400 fuel rail/injectors, upper intake/tb, all sensors, etc. except temp sensor)

-I had done identical 3500 swap with Milzy's kit on a '04 Grand Am that worked out great, did nothing different on this one and re-checked all of swap specific stuff.

-New fuel pump module & filter, (I wonder if I got defective pump)

-cleaned stale fuel out of lines & cleaned original Alero fuel rail/ injectors as well as I could

......What I suspect: clogged catalytic converter, stuck/ bad injector, bad sensor/elect engine control part
...don't really know how to test above, I want to try testing cat by loosening head pipe nuts (leaving gap) to let exhaust out before cat and take for short drive
__________________
2004 Galaxy Silver Metallic SE - 3.5 Swap - GT Chrome Rims

Last edited by over's ga; 12-30-2012 at 02:51 PM.
over's ga is offline   Reply With Quote
Old 12-26-2012, 06:50 PM   #2
AaronGTR
BlingWithBallz
 
AaronGTR's Avatar
 
AKA: Aaron
Join Date: Aug 2002
Location: Detroit area, MI
Age: 39
Posts: 12,197
Vehicle: 2000 Grand Am GT1 2dr
AaronGTR has made plenty of valid pointsAaronGTR has made plenty of valid points
Double check the external crank trigger. I know some people have had issue with the engine running right when doing that swap because they didn't have the gap adjusted just right.


Other than that... with how much work you did and how much stuff got replaced, it's hard to narrow it down to any one thing. You have no idea what was good before hand and what wasn't. Could be the cat. Could also be bad/dirty injectors or a problem with one of the sensors. Time to start cleaning stuff and checking anything you can. Run some fuel system cleaner, clean the MAF sensor, make sure the vacuum lines are all tight and no cracks, etc.
__________________
The few, the proud, the boosted!
13.788 @ 103.73 mph (3/2011) 320 whp and 300 ft/lbs torque. (3/2011)
See it here. the total package.
AaronGTR is offline   Reply With Quote
Old 12-26-2012, 09:21 PM   #3
over's ga
GAGT - Member
 
AKA: Jim
Join Date: Jul 2012
Location: PHX
Posts: 47
Vehicle: '02 Alero, 3500 swap
over's ga Gettin' there
I readjustment crank trigger once after talking with Milzy. No change. I may try some different gaps just to see.

I'll try some fuel treatment/cleaner, all vac lines look good but I got to recheck everything, also want to put stethoscope to each injector to here them clicking.

Not tripping the light has me a bit lost. THANKS for input
__________________
2004 Galaxy Silver Metallic SE - 3.5 Swap - GT Chrome Rims
over's ga is offline   Reply With Quote
Old 12-28-2012, 05:37 PM   #4
over's ga
GAGT - Member
 
AKA: Jim
Join Date: Jul 2012
Location: PHX
Posts: 47
Vehicle: '02 Alero, 3500 swap
over's ga Gettin' there
It was the cat!

I pulled down the head pipe after loosening nuts almost all the way out, took for a loud test drive and its got balls now

just got to find cheap replacement
__________________
2004 Galaxy Silver Metallic SE - 3.5 Swap - GT Chrome Rims
over's ga is offline   Reply With Quote
Old 12-28-2012, 05:46 PM   #5
over's ga
GAGT - Member
 
AKA: Jim
Join Date: Jul 2012
Location: PHX
Posts: 47
Vehicle: '02 Alero, 3500 swap
over's ga Gettin' there
any ideas, on budget cat replacement??

I can get just universal new cat and weld in place or spend quite a bit more and get complete cat with pipes to bolt in.

I have a mig welder and can do universal, but I thought it was stainless steel? can I weld with regular mig wire to that pipe and new catalytic converter?
__________________
2004 Galaxy Silver Metallic SE - 3.5 Swap - GT Chrome Rims
over's ga is offline   Reply With Quote
Old 12-28-2012, 06:08 PM   #6
sleepyalero
▂ ▃ ▅ ▆ █ ▆ ▅ ▃ ▂
 
sleepyalero's Avatar
 
AKA: Nathan
Join Date: Jul 2011
Location: Unknown.
Posts: 5,909
Vehicle: 2001 olds alero GLS
sleepyalero a trusted member
Have Milzy make you a custom no cat pipe he did one for me for like I forget... 125-175 or something...
__________________
2001 | Alero GLS | 3400 | 6MT


2012 BMW S1000RR, full exhaust, power commander 5, dyno tune, 190WHP.
sleepyalero is offline   Reply With Quote
Old 12-28-2012, 06:21 PM   #7
over's ga
GAGT - Member
 
AKA: Jim
Join Date: Jul 2012
Location: PHX
Posts: 47
Vehicle: '02 Alero, 3500 swap
over's ga Gettin' there
I'm in Az, I need to pass emissions before it can get registered, thanks though
__________________
2004 Galaxy Silver Metallic SE - 3.5 Swap - GT Chrome Rims
over's ga is offline   Reply With Quote
Old 12-29-2012, 06:04 PM   #8
AaronGTR
BlingWithBallz
 
AaronGTR's Avatar
 
AKA: Aaron
Join Date: Aug 2002
Location: Detroit area, MI
Age: 39
Posts: 12,197
Vehicle: 2000 Grand Am GT1 2dr
AaronGTR has made plenty of valid pointsAaronGTR has made plenty of valid points
Quote:
Originally Posted by over's ga View Post
any ideas, on budget cat replacement??

I can get just universal new cat and weld in place or spend quite a bit more and get complete cat with pipes to bolt in.

I have a mig welder and can do universal, but I thought it was stainless steel? can I weld with regular mig wire to that pipe and new catalytic converter?

Do you have a stock down pipe? That is not stainless. It's just regular coated steel. You can weld a universal cat to it with normal MIG welding wire. Just get a decent sized high flow cat. You don't want to go cat-less anyway. They sound like crap without one, smell bad, and pollute. Plus there isn't much power to be gained over a high flow.
__________________
The few, the proud, the boosted!
13.788 @ 103.73 mph (3/2011) 320 whp and 300 ft/lbs torque. (3/2011)
See it here. the total package.
AaronGTR is offline   Reply With Quote
Old 12-30-2012, 02:47 PM   #9
over's ga
GAGT - Member
 
AKA: Jim
Join Date: Jul 2012
Location: PHX
Posts: 47
Vehicle: '02 Alero, 3500 swap
over's ga Gettin' there
I decided on bolt in direct fit, found good deal online for $135 shipped

http://www.usautoparts.net/catalog/i...ce2%7C0&Npp=10

on the universal ones, yes I guess the cat itself is stainless but the tubes are more a mild steel. I could of done it but I'm feeling lazy, any welding and fab work I want to do on my jeep
__________________
2004 Galaxy Silver Metallic SE - 3.5 Swap - GT Chrome Rims
over's ga is offline   Reply With Quote
Old 12-31-2012, 01:56 AM   #10
unchained_01
Manic Mechanic
 
unchained_01's Avatar
 
AKA: albert
Join Date: Dec 2010
Location: cumberland md
Age: 55
Posts: 677
Vehicle: 2003 grand am gt
unchained_01 Gettin' there
Send a message via MSN to unchained_01 Send a message via Yahoo to unchained_01
Plus you should see how much you can get for your old one. Recycle it. Some bring decent money
__________________
Building my own concept
unchained_01 is offline   Reply With Quote
Old 12-31-2012, 02:34 PM   #11
over's ga
GAGT - Member
 
AKA: Jim
Join Date: Jul 2012
Location: PHX
Posts: 47
Vehicle: '02 Alero, 3500 swap
over's ga Gettin' there
Thanks for reminding me, I go to metal recycler a few times a year
__________________
2004 Galaxy Silver Metallic SE - 3.5 Swap - GT Chrome Rims
over's ga is offline   Reply With Quote
Old 01-15-2013, 12:15 AM   #12
over's ga
GAGT - Member
 
AKA: Jim
Join Date: Jul 2012
Location: PHX
Posts: 47
Vehicle: '02 Alero, 3500 swap
over's ga Gettin' there
just wanted to close this.

...Got the new ready fit cat installed & the car runs like it should, what a difference!

-everyone says service engine light should of been on with bad cat, didn't apply here.
-using a IR temp gun didn't show cat was bad (according to online guidelines)
-auto trans shifted as if trans was bad with clogged cat, shift fine now.
-even under hood idling you can tell it is flowing free compared to before.
-don't forget diagnostic trick of loosening cat pipe nuts a bit to check if it runs better
__________________
2004 Galaxy Silver Metallic SE - 3.5 Swap - GT Chrome Rims
over's ga is offline   Reply With Quote
Old 01-15-2013, 09:29 AM   #13
MilzyZ34
Fastest FWD GA
 
MilzyZ34's Avatar
 
AKA: Mike
Join Date: Aug 2003
Location: Dayton, OH
Age: 37
Posts: 877
Vehicle: 1999 Grand Am GT
MilzyZ34 Gettin' there
Send a message via AIM to MilzyZ34
Quote:
Originally Posted by AaronGTR View Post
Do you have a stock down pipe? That is not stainless. It's just regular coated steel. You can weld a universal cat to it with normal MIG welding wire. Just get a decent sized high flow cat. You don't want to go cat-less anyway. They sound like crap without one, smell bad, and pollute. Plus there isn't much power to be gained over a high flow.
i don't think it's that bad without a cat. the biggest thing is i take comfort in knowing it will never clog again if i delete the cat. power gain over a highflow depends on mods, but it can be a good amount.
__________________
1999 Z34 - Was a Stage 3 3800 Supercharged, but not fast enough so I have some new plans for her.
1999 Grand Am GT Race Car - 12.1 sec ET, STOCK motor, 10 psi
http://www.milzymotorsports.com
MilzyZ34 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 12:52 PM.


Powered by vBulletin® Version 3.7.2
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright 2011 GrandAmGT.com
RedlineGoods.com