3400 GM Engine 3.4 Liter Motor Explanation And Discussion




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Did this video help you?

Bud E: '02 Rendezvous leaking alot of oil. Seems to run down mainly the back side of the engine. Oil pan gasket seems OK. I did replace the front crankshaft seal under the balancer (what a PITA!), and that seemed to help, but I would like to try to tackle the remainder of the leaks. What's the next most likely culprit? Valve cover gaskets or Lower Intake Manifol gaskets?

Bud E: Been fighting a recurring problem for the life of the car ('02 Rendevous). Occasionally, I get a crank, no-start condition. Car will start, run for a second, then cut out. Attempts to restart then result in just cranking. A shot of ether will cause it to run for a few seconds. No codes when scanned. The crankshaft position sensor was replaced (on back of car) by the shop as well as the fuel pump, and I replaced the PCM and coil packs / plugs / wires. It seems like every time something gets replaced, it's fine for awhile, then it will act up again a few weeks later. Strange thing - I had to replace the front crankshaft seal (under the harmonic balancer). The other crankshaft position sensor sits there. I did not replace this. After I put the balancer back on and tried to start it, it showed the crank, no-start behavior, where it was fine before I started. I tightened down the crankshaft bolt (I think the balancer was not fully seated), and low-n-behold it started up. I read this sensor has nothing to do with starting, but seems to be more than a coincidence. Car is OK now, but I feel I never fully solved this issue. Thoughts?

Darryl Harris: Also the timing chain housing gasket often springs a leak they are hard to spot also. Check under car with on lift our jack right under power steering pump right in the oil pan area. Delphi also put junk pressure regulator valve on here causing it to either be sucked up into the intake through vacuum lines or leak pass the diaphragm and can be a big fire safety issue. There is a recall for the3800 not these so look out for that ,both engine FPRs leak past the diaphragm inside the fuel pressure regulator

denis perez: I have an alero 2000, 3.4L , I already change, fuel pump, sparks, spark plugs, egr valve, idle air control, ignition switch, map sensor, throttle sensor, and my engine still shake in neutral or stop sign, its feel like going to shut off, what could be the problem?..... somebody give me any idea, this touch my pocket really bad.

Clayton Z: 03 Grand Am GT1. Had Motor replaced about a year ago. Now I'm leaking coolant in a steady stream from head gasket although No water in oil. How often do the heads go Bad or get warped. Wondering if just replacing the head and intake gaskets would be the fix or should I also replace cylinder heads?

DON KAIN: I just bought a 03 Aztek with 160,000 on it, drove it twice engine sounded pretty good strong yet. So I bought it, within 24 hours I drove it home and then to work not issue's went to leave work started it up and the engine noise was bad. The first thing that I thought of was a rod, then valve's floating, or piston or pistons slapping. I was hoping it would go away when it warmed up, run it for about 15 minutes no change so I decided to try putting in some Murphys Mystery Oil in it. But it stayed about the same if not a bit loader. Went to my second job, and a few hours later when I left the same thing, hoped it would quiet up but it didn't. So stopped at Walmart on the way home and bought some STP Oil additive the small blue bottle very thick oil improves viscosity and helps with engine wear and stuff. But after putting it in there is no change almost as if it is gradually is getting louder. It sounds like a diesel pretty much now, don't know what to think now other than go and ask a mechanic. And I contacted the guy I bought it from and he said it was fine, I don't know what to tell you!?! Anyone have any Idea's other than small claims court!?! Thank you!

Brenda Holm: I had (and I am thinking about getting back) an 02 pontiac aztek. Runs like a scalded dog most of the time. However, after sitting over night the next day when you start it and try to take off it would chug, lug, spit and sputter. Shut if off for about 45 minutes or so.. start her back up and run like a dream all day long. Traded the car... between us and the new owner we have changed: plugs, wires, fuel pump, fuel filter, a tiny vacuum hose on the charcoal cannister, another part on the cannister sorry cant remember what it is called and ran a can of sea foam through it with no change. Problem is getting worse according to new owner, takes longer to "warm" up enough to drive and she said when she removed the gas cap completely the car dies... thoughts?

kendell fontenot: does anyone kno wat a light tappin sound can mean on a 03 oldsmoible alero, i did nothing but clean nd shave the cylinder heads?

Chris Wilickas: I have an 2001 impala 3.4. Starts great but when you hit the gas pedal the motor surges. (reeves up and dies back down) very little power when you hit the pedal. I can Idle and the engine runs perfect. Any ideas

jeremy fahrni: Thank you. I have this same engine in my 02 Montana. This is really helpful. How long do you think changing the intake manifold gasket would take your average backyard mechanic?

Coryhughes00: Im assuming intake manifold gasket. Getting air in the cooling system, losing coolant, over heating issues. Fluids do NOT mix though, so thats good. I bleed the air from the line every day or two and add some coolant until I can fix it right. Any recommendations on what types of gaskets to fix these with? My last 3400 blew THREE head gaskets. I heard there was a good set that lasts longer now. Any tips woul be great! Thanks

Ryan Haas: Do yourself a favor, get rid of the car. 3.4= garbage. If you wanna stick with GM, get something with a 3.8. Bullet proof engines. 

Edson Valdez: I have a 2002 Grand Am GT with the 3400 and it has hard time staring, I drive it around works fine but if I go to the store for about 30min to an hour than its hard to star again. I tried turning the ignition to run a few times before starting seems to help out just a bit, but it still has a hard time. Im thinking its the fuel pump. I also change the fuel filter and it was pretty clogged. Any tips? 

81kmoua: I have a 2002 Buick Rendezvou 3400 sfi engine, there is noise coming from the engine. When you turn on the car the noise comes on and when you step on the gas it gets louder almost like a whistling sound. I checked the power steering fluid and it was out and I filled it, same nosie . I replaced the water pump and still nothing changed. My friends told me that it could be the harmonic balancer is bad. But I don't know where it is located. I would like to know what the problem is. Please any advice would be great at this time.

Chris hauser: lol i managed to crack my Head over my 5th cylinder on my 02 ga gt... It caused constant misfires but still ran, also burned gas like a mofo... BUT i no longer have the car because i upgraded to a Cadi 

sterling5989: Mine is being hesitant especially when you put it into gear. It has that annoying ticking noise when it does it and the whole engine vibrates bad.

DJR5280: Do the 3.5 L chevy malibus have head gasket failure issues ? Mine is a 2005 and it seems like i have excess air in the cooling system. I never had a problem until i cracked the bleeder screw by the water pump and ever since it seems like i have excess pressure. I have drained the cooling system and bled it and no luck.

Joe Garisto: Hi I have 2004 chevy venture and I am having problems starting it up it will start and then die, I have to hold down the gas for a while and then it stays on. In the summer I opened up the Idle Air Control (IAC) Valve and cleaned it out with carb cleaner and it worked for months. I was thinking of opening up again and cleaning it out again, what do you think? I have a feeling the plunger is not sealing the seat because of carbon build up.

mak69007: My 01 Chevy Venture, is Idling to high, speratickly, but becoming more constant. I'll shut it off, start it back up, and it will run fine for a bit. I'll be going, then if feels like someone is touching the gas. Please HELP

Maryjane Glass: I need someones help I have a loud noise coming from my engine I'm thinking its the oil pump cuz the slap noise sounds like a lifter and doesn't stop when it warms up what do I do I'm afraid to drive it and blow the motor 

Keith c: you solved my idling problem ive had 4months god bless you.That was my problem.

sethhigby: i have a 200 pontiac grand am i recently had the upper radiator hose blow. i taped it up and filled it with fluid just to make it home about an hr away. 2 miles from home i pulled up to a stop light and the thermostat red lined i shut it down let it cool off then made it the rest of the way home. i changed the hose filled it up fired it up and fluid started leaking from the front of the engine. I thought it was the water pump. I replaced that but still seems to be leaking i can't track it down but it is dipping from the harmontic balancer. Any suggestions. thanks 

sethhigby: i meant 2000

Katie Jean: Ticking/clicking noise coming from engine, 3.4L 03 Alero. Happens when revving, when in neutral, and when idle in park. Thinking maybe a lifter? Not sure... Low oil pressure though. Any ideas? 

Albert Eble: 02 Buick Rendezvous. On occasion will start right up, grumble and then die after about one second. Then won't start, just cranks and cranks. If I let it sit 15 minutes or so and come back, then usually starts right up. Runs great once running, no stalls, hesitation or other issues. Problem only happens once in every 5 starts or so. Fuel pressure is good (58 psi). No leakage (gas, coolant, vacuum) in engine that I can see. Any advice what to look for next?

Jose Sanchez: My 2001 Alero hesitates when starting first i thought it was the fuel pump but it is working fine it runs fine it idled funnny once but not anymore, any help would be greatly apreciated

Oaklandcoliseum: Worst engine ever .Starts Great first in the morning but once warmed up the engine shakes and fights it's self trying to restart after short or long ride . Has anyone solved the warm restart problem ?

mario villa: These engines are pice of crap no joke

Randall Cooper: I have a 1999 Grand Am with a blown engine, 3400 v6. Bought a good engine from a wrecked 2000 Grand Prix and find out its from California and the emission controls wont hook up. Can I remove that and make it run?

Ashton Cowling: I just bought a 2002 Malibu someone decided to put this engine in it. I am trying to find how old the engine is and the problems. Engine has a 99 etched on it I haven't seen any leaks

James Bessette: I have a 01 Chevy Monte carlo. My car always starts rough i gotta hold down gas for it to start. Also once its warm she likes to stall after i sit at a stop light or sign then turn a corner or something it stalls. I replaced fuel lines, idle motor, pcv valve, plugs and wires, and fuel filter. What could it be on the 3.4 sfi...

david long: I'm completely lost. I have a 2000 grand am gt. I had the engine replaced and it ran fine. No problems until about a month later. Now it sometimes will either overheat or I will have heat inside the car and loose it and then I can shut it off let it sit for a couple mins and it'll be fine or it will just be fine to start. I put a new coolant bottle, new thermostat, and a water pump off the old engine that I know was good. Sometimes it will push coolant back out the bottle through the overflow or just air after I shut it off. The car runs good. It doesn't smoke. Starts easy. Everything. When it over heats or when I have heat and loose heat the radiator hoses are both soft when everything is fine they are both firm. Neither one feels to soft to where it should collapse. Help

MrHamp32: Hey man what s your thoughts on this? I recently changed blown head gasket on a 2001 chevy impala 3.4 I got everything put back in proper order per Haynes Man. Engine will spin but wont start. I have about 55-60 psi in fuel pressure. compressions good and I have spark at every cylinder. check again this morning to verify I have everything hooked up and tight and no luck. Any ideals?

naptownblues: At 2:40 you point out the repair to a vacuum line, I'm interested in the line underneath your finger and the container it leads to out front. Any ideas??

Sal Perez: Where is the cranshaft position sensor? Is there one or two

Matt Cogar: 2000 pontiac grand am gt. I've noticed when i get to about 1/4 tank of fuel the car won't start. If i rock the car back and forth while turning the key to the on position to engage the fuel pump it will tend to start. Inline fuel filter has been changed. Fuel pump screen clogged? HELP!!!

phil johnson: My 2002 grand am is idling very high around 1500-2000 I have checked the IAC, TPS, and any vacuum leaks and still can't find the problem any idea's?.....

Kaneshia Wagner: And how often should you change your Relays?

Kaneshia Wagner: Where is the pcv valve located?

ProApathetic: I have an 02 Grand Am GT, and it'll hesitate to start sometime and when it happens some time it takes quite awhile for it to start, but it will run fine, also i doesnt feel like it has power i have a couple of friends with gt's and se's and they can get 0 - 60 in around a 7 - 9 sec range mine will get 11 

salim turkovic: Thanks for video, I found it very useable. Got some experiance fixing cars and just did lower manif gasket on my Aztek 3.4L.

Antwaun Robinson: About how much motor oil do I put into a bone dry 3400 engine? 

Fernando Warren: I have the 3400 in a Chevy venture and when I start it up in the morning it knocks pretty bad But once it warms up it goes away and runs fine, how can I fix this and why is it doing this?

meTimetraveler: the oil pump drive can leak oil, where you have to replace the "O" wring. Symptom oil on the ground. Pooled oil under the throttle body on the lower intake manifold.

copcarmehanic rick: (MECHANIC 37 YRS) i work at a used car lot, everyone of those i get i usally have to change thermostat, and int/ gaskets. sometiomes head gaskets. make sure if u do intake, use 'upgraded' felpro gaskets(metal) instead of plastic. its worth it.

Victor Valencia: MY car is a pontiac grand am gt and it started knocking after i start it and stays knock its not loud or anything and it still runs good but idk what the knock is caused by?!! need some help!!

Charles Mcpeek: I have a 2002 Grand am gt with 3.4l.I recently lost my heat and the car runs warmer than it it normally does.Also after this happend,when it gets warmer it seems like it p

laszlo tabor: Hello, I have a 2000 alero 3.4 v6..trying to replace camshaft sensor & in order to do this, I need to move power steering pump outta the way.. Removed the 3 bolts (through the pulley access holes) but can barely make it budge..only a few cm up.. Am I missing something? Do I have to remove the pulley in order to "lift" the pump? Thanks and good work!

pontiacaztek2: Vacationtime, thanks for the videos! Need your help.... my 1996 Olds Silhouette with the 3.4 liter engine.....well, the dealership told me that I need to have the crankshaft seal replaced. Any idea on how much this disaster is gonna run me? 

Rodney Turner: Pontaic 2001 grand am GT 3.4 liter motor if u know what the problem is please help and god bless
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3400 GM Engine 3.4 Liter Motor Explanation And Discussion 4.5 out of 5

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3400 GM Engine 3.4 Liter Motor Explanation And Discussion