3400 GM Engine 3.4 Liter Motor Explanation And Discussion




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martinez1701a: Ive built a few of these LA1 3400's and i like them alot they are good engines when built right. If ur gonna build one ALWAY GET THE METAL LIM GASKETS!!! The plastic ones are all trash and i noticed the intake runners on them are smaller too. Also if its a 99 swap out those multec injectors for bosch type 3 from a 90's Tbird will run like a champ just make sure grind down the bracket posts. For my 2001 grand am i just built i use 28lb trailblazer injectors with a fuel pressure reg from a 99 grand am they run at 43psi

Richard Ballantyne: This is a great little motor, I have the same thing in my 02 grand am se1, only problem is the lifters on cold start. Always ticking for a few mins until warmed up

Caleb Fulton: I have some leaky fuel lines on my alero(3400). My question is, which fuel line is the return and which is the feed? When I'm looking underneath the car underneath where my drivers seat would be, which fuel line is what?

Craig Newton: The #3 rocker bolt stripped and push rod has fallen into the engine. What do I need to do to fix this. The problem came on all of a sudden with a misfire code P0303 and a loud ticking over the #3 area. pulled off the valve cover and found the rocker completely loose and no push rod.

Bobbi Gunderson: Having some problems with a 2004 Oldsmobile Alero 3.4L. It's idling rough and after it's been running for a while it doesn't want to start, you have to ride the gas for a few seconds to get it to start and hold it at 1500-2000 rpms for about 5-10 seconds to make it stay running. Has no problems when the car is cold. I replaced the coolant sensor and the purge solenoid last week. It's still throwing the purge solenoid code, i've checked and the vacuum hoses are good. Now it is throwing an EGR code as well - P0401. The Egr has been cleaned a few times before and it builds up crap again really quick. The car is not overheating. When I changed the coolent sensor the car had been driving without antifreeze for who knows how long (it's a friends car).

Maadi Wilbanks: Ok so, this motor is obviously difficult to work on in a Venture van.  Sometimes I would enjoy taking a hammer to it.  I recently had codes for EGR and EVAP.  I replaced the EGR cleared the codes and it ran fine for two days.  I get in it drive 1 minute from my house and it begins to jerk then dies.  It set a code for EVAP again, so I lifted the hood and the evap line going into the purge was broken at the plastic connection to the purge.  I went ahead and got a new purge valve and replaced it.  I also manipulated a hose to run from the purge to the evap line.  The hose is not bent.  Upon test driving it, it jerked twice then died again when slowing down to turn around.  This time it set no code.  Do you think I might have manipulated the hose to long I used to connect the evap line to the purge?

wranglercjseven69: Hey thanks for your post im looking to change egr tube in my 2001 pontiac aztek same 3.4 any insight on how to get it done will be awsome to me thanks

Carmel Amour: How do I replace my pcv valve in my 1999 Oldsmobile alero? Where dose it plug in at??

Matt Owen: I'm planning to take on an engine replacement job on a 2003 Buick Rendezvous and I'm wondering if anyone can tell me if the engine will come out the top on this thing. Can I just pull the front clip for the room to do so? Or? I don't have a car lift to drop it out the bottom, so I don't want to tell the guy I can do it and then find out when it shows up that I need a lift.

Jason Harvey: I have a 2001 Chevy Venture, that Im thinking has a blown head, The night I bought the vehicle it ran fine had no problems other than a shake when accelerating, but that's not the issue. I started driving home the next day after purchase, got about 3 miles from where I started, and overheating begins, and speeds slows to 20 mph, I shut it down immediately. Waited on it to cool down and got home 3 miles later again getting hot. I changed the rad cap and added coolant from napa, just to be sure it wasn't a blown head, I checked for water in oil and oil in water, and even checked trans fluid, didn't see anything wrong at the time. Drove it about 7 miles and loss heat, then overheating and shut it down again, got to a mechanics shop, they did a block test, not showing blown head however the shade tree mechanic noticed it had sludge on the valve cover inner wall and said well its had a blown head gasket and looks like they drained the sludge and replaced old engine oil. This is evident-ally a scammers way of selling a blown head gasket vehicle, he said to get some blue devil pour and go head gasket sealer. Tried that, but bled the cooling system after refilling and didn't over heat, ran good and had good heat. So thought this fixed the problem. Next trip on the way home its overheating again, so I checked the bleeders maybe there was air in the system still sure enough pushed a lot of air out before getting coolant. After bleeding it no problem but since then in order to drive this I have to bleed the coolant each time and add maybe a cup of coolant to top off. Is this a blown head or is it the intake man. gasket? I don't have a lot of cash to dump into this, and hoping for an easy fix but figuring its not going to be. Just today the trans started shifting hard not sure if that helps with all I have said but, it is up to date info as to what I have seen go on with this vehicle.

Timothy Tegmeyer: I have a 2004 Monte Carlo with the 3.4 in it. About to hit 97K. Any advice on what to do for routine maintenance around 100K? I was planning on doing some AC Delco Platinum plugs and an AC Delco wireset. I always wonder what I should expect out of this motor in terms of lifespan. My money would be that the 4T65E transmission gives out before the motor ever does.

Proto_The_Brave: i have a 2000 monte carlo with a 3.4 and it dies when i stop at stoplight or brake i think its the egr value but not sure

andrew morrison: hello, i have a 1998 pontiac grand am se with a 2.4L. i also have a 3.4 with the tranny attached that i pulled out of a 2001 alero. would you by any chance know if i could put the 3.4 in my pontiac or would there be a lot of new parts needed? i have all the parts from under the hood off that alero so that shouldnt be a problem unless its just different cv axles needed. Any help would be greatly appreciated

Ashlee Holbrook: Anyone know an easy way to get the trans cooler lines hooked back up to the transaxle?  These 3400 don't give you much room to move around in.  Thank you to anyones advice.

Dr. Logan: Does anyone know if you can swap a Pontiac Grand Am 3.4 with a Pontiac Montana 3.4? I think it would work, it's the same engine, just have to swap out some connections, some pulley's, and possibly the transmission dipstick. Let me know... Please.

B Mckinnon: I would like to compliment you on your discussion. Your advice is spot on and you're helping a lot of people. Some advice to those of you that are leery of doing your own repairs. Never do the repair yourself if it has to be done in a hurry. This is where mistakes get made. Always be organized, take your time and fully research the repair before you do it. Good luck.

Luther Humphrey: thanks for your insight... haven't checked to see where that white hose goes..but when i checked the code it says P0404 ...so it seems to be the egr is causing it to go into limp mode

my03fx4: Can I swap a 3400 out of a 2002 grand am into a 2003 alero with the 3400? The guy at the junkyard says it won't work.

jamie parfait: Easy way to clean the EGR valve on the 3400 series motor..... off a 2000 Montana

Baba Tee: I have a 2004 Oldsmobile Alero 3.4 Litre, bought it off a friend of mine, had a nightmarish experience with Overheating, messed up the engine that came with it, replaced it with another engine, and the overheating persisted, read through some opinions on the web, told my Mechanic to check the manifold intake, he checked replaced the gaskets but the overheating persisted, fortunately my Mechanic is as dogged as i am, he insisted that there must be a reason the overheating won't go away, so he disconnected the Complete exhaust system and allow the the car to run, noisy though but that solved the problem. the catalytic converted was bad and was blocking the free flow of the exhaust, he remove the catalytic converter and replaced it Voila, overheating stopped, now my Alero is my favorite car. Overheating seems to be one of Alero's negs. I hope this helps. 
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3400 GM Engine 3.4 Liter Motor Explanation And Discussion