3400 GM Engine 3.4 Liter Motor Explanation And Discussion




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

David Weesner: I have an 02 rendezvous. I currently have the heads off for gasket replacement. As you know, parts are everywhere in my garage. It ran fine before I took it apart, but im wondering if I should replace or have the valves checked as long as I have it off. I just bought the car and have no idea of the history. I am no expert on heads and think maybe I should take them to a shop and have them checked? Is this just asking for a large bill? I am pretty handy and usually go for DYI and I took it all apart no problem. I could do the valves with good advice. I am a machinist and have no problems following instructions. Thanks for your videos! Any thoughts on doing what is best at this time? Car has 233k so who knows

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

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.

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?

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.

Niko Gauna: I have an 02aztek and the coolant hoses are always hard, we have done the water pump and the temp levels seemed more stable, we did the thermostat next because the levels started going crazy inline somewhere sat for a long time, or when I had it idling for a long time, 30 mins or more it would climb, never in the red,... but still to high for my liking. It does hesitate a little bit when u start it sometimes, other Times the remote start goes off but don't start the car. 134, 000 on her

big bubba: have this engine in my '04 Impala. Have over 175,500 miles on it.

G. Phillips: I am having a hard time locating parts on my GM 3400 sfi engine. I do not have diagram or manual. What is the specific name of the hose that is connected to the PCV? Also, what is the name of the hose that is connected on top of the air intake duct that is then connected on the back end of the rocker arm cover? That hose in particular has a plug on the end that needs to be replace so it can fit tightly in the cover. 

MissLLP: Where is the thermostat housed?

mario villa: These engines are pice of crap no joke

Marcos Ramirez: Hi!! @ 2.35 can you tell me were that line goes, it get broken and I don't know were to look at thank you for your video 

Joshua Snyder: I have a 99 alero 3.4l. With ~162k miles. The car. died on my wife. I pulled CEL codes. Only P0300 multiple miss fires. All cylinders receiving spark. Will barely stay running for 1 minute. Sounds like2 cylinders missing. I did notice the oil pressure light is on. Any suggestions would be appreciated. I'm thinking oil pump.

John Paulson: Well I gave up on doing the work myself in fear of creating a bigger mess. So to the shop it went. A local shop who I very much trust looked at it and quoted me less than $700 for the intake gasket. Since I budgeted more than that I will have him check some other items while they are there. New thermostat and maybe some new coolant lines are in order. He said no labor on those since we would already be in deep. Fingers crossed the overall stays under a grand.

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!!

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 ?

Eric Yoface: I have a 02 grand am and i noticed if i'm in park and i rev the engine a bit, it goes from 1500 rpm then drops to 400 but it bounces to 1000 then goes to its normal idle at 700, any thoughts on what can be causing this issue? also idles in drive really rough like its almost bogging.

Deuce Seven: thoughts on the 3.4 in early f body camaros? degreasing these engines what should be covered pressure wash is a no no right?

fatback1980: Hello, thanks again for the great videos. They really helped me change my intake gaskets and head gasket. I now need to change the egr tube on my montana. So, do you figure I can reach the nut on the manifold to loosen the tube from below, or should I tilt the engine forward and get it from the top? Thanks!

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?

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

8goodlyfe1: Hello. The check engine light came on, scanned it, and received the codes P0108 and P0101. I proceeded to disconnect and clean the MAF and there was gasoline in the air intake duct, all over the maf, and the air filter. What could have caused this and how to fix it? thank you in advance for reading and responding.

Danny Storto: My 3400 is in a 01 grand am n just the other day it started to lose power while accelerating. Now it has NO power pasy 4000 rpms!!! Its not spark plugs wires or the mass air flow sensor. The only code that is going off is an oil pressure sensor. HELP!!!!!!!!!!!!!!!

oscar contreras: I have a 2004 impala and I recently discovered a bad leak under a metal hose that runs under the 3400 upper intake manifold. It lets off a hissing sound which I believe is an obvious sign of pressure leak from a metal pipe. I was wondering if it was absolutely necessary to remove the intake manifold or if it could just be disconnected and pulled off another way. 

clwilu94: Someone please help. I have a 2000 grand am with this motor. Cant figure out why it starts up but will not stay running unless i rev it . When it gets below 500 rpms it dies. Any ideas would be appreciated.

Vacationtime247: You will need an OBD II scan gauge to pull up the codes. Any autozone or parts store will run the codes for free. The pinging could be bad gas or the elevation. Possibly the EGR system. The EGR system tends to get carboned up. Change the EGR and clean the port with a coat hanger and strong solvent. Also check for vacuum leaks with a water bottle or carb cleaner. Be sure to check your oil too, make sure there isn't water in with the oil indicating a bad intake manifold. Hope this helps. VT247

Elante Ford: O what might you know about the gmc Jimmy. Cause i think I need some new battery cables any imfo on a quick fix with that please and thank you

Vacationtime247: Loosen all the 4 bolts holding on the pulley. Take off the serpentine belt. Take out the 6-8 bolts holding on the water pump marking the mounting location (makes re-installing the new one easier). Scrape away all the excess gasket material on the mounting surface. Coat both sides of the gasket with RTV black silicone. Install new water pump, install pulley, install serpentine belt, fill radiator and overflow up with coolant. VT247

John Paulson: I'm back. My '01 Alero has 135k and seems to have an intake leak. It idles with a very slight roughness and has a slight hesitation with slight acceleration. A little more throttle cleans it up. Temperature wise the car runs a little above mid-range but approaches 3/4 when in traffic. When I shut is off I hear a hiss for a couple seconds and it sounds like it originates from the intake bolt where coolant seeps from. Compression is in the 140's on all 6 cylinders, so thinking intake. More to come

Mike Thexton: I did watch that video before, I forgot about it though. I remember watching that video and thinking to myself, wow that's gonna happen to me, I just know it. I'll check that out thanks.

CS Bens: 2000 Pontiac Grand Am w/ same engine is often stopping after 15 minutes of driving. Wait 3 to 10 minutes it starts up and goes a while longer. When it first happened it would go almost exactly two hours and stop. Would wait 20 minutes, make it to the 1st gas station, fill up and it was good. Now it happens after 15 minutes and with full tank. Any thoughts? Mechanic was mystified.

Tyrone Cox: I have a 2002 Grand AM with a 3400 in it. My oil pressure like keeps coming on. I have been trying to find out where the oil pressure sending unit is located, but cant find it If you know can you tell me where it is located so the I can replace it. I'll appreciate your help.

Vacationtime247: Check the fuses and check for electrical wiring going to the starter. Perhaps the + lead for the starter relay isn't tight. VT247

Vacationtime247: Almost sounds like something coming out the vent. Perhaps a wire that has gotten hot. But check under the hood for any fluid leaks also. Might be something coming off the engine and burning off on the exhaust. VT247

Mike Thexton: There's never been a white wire in mine..I even cut back the tape to solder the red one back on and it was the only wire going to the plug. There is even 3 identical orange/red plugs from the 3 empty slots. I appreciate the effort though! Looking at pictures of rendezvous wire harnesses on ebay(only place I found a picture of it, I can see that the one that goes to the alternator has only a red wire, just can't tell where it's position is. I will just find a rendezvous around town and look

Vacationtime247: For the top alternator plug in, from front of the engine to the back firewall, the first slot is empty, the second is where the red wire goes, the 3rd the white wire, the fourth space is empty. LMK how it runs now that it's all fixed. VT247

Vacationtime247: A cold air intake won't ruin anything. May give you a few extra horsepower. But it won't affect the operating temperature at all. Does your car overheat or the temp spike? If it stays at one certain temp (about the middle of the temp gauge) after the car is warmed up, then it's fine. VT247

Vacationtime247: It's best to take off the upper intake and clean the passage. But, it is possible to remove the EGR valve, 2 10mm bolts and spray carb cleaner down the passage with a coat hanger used to break up carbon. Without taking off the upper intake, the engine would have to eat all that junk. VT247

Richard Griese: probably 15mm. these cars are almost all 10,13,15 mm :p

John Paulson: ...I am on a very tight budget and will have to tackle this myself. I think it worth the gamble to spend the $150 or so in parts and just do the intake to see if it cleans up the issue of using coolant at a rate of about 1/2 gallon per month. The spark plugs all look good and I do not see any arcing of the wires in the dark. Do you think I could get away with only doing the intake and add a new thermostat while I am there?

Vacationtime247: Make sure the marks are lined up. Lube it up with some soap. Push the plastic connector all the way to the end of the metal tube. If it still is causing trouble try a small screwdriver and maneuver it in. Hope this helps. VT247

Vacationtime247: Yea, a gallon of gas and a match would certainly be cheaper. But I'm going to say it's probably spark related no start. You mentioned that a wire had to be repaired on the coil pack. Read this article. I'm betting it's in the coil pack or the crank sensor. Just cut and paste but use a . instead of the (dot) easyautodiagnostics(dot)com/ignition_gm/ign_module_test_1.php VT247

Babbett Koehler: Apparently my previous comment was erased, I was saying that I have a 2003 Pontiac grand am with this same type of engine and it has been not wanting to start. it will do fine unless I drive allot or over 60, and yesterday it almost seemed like it was trying to die on me as I went to accelerate from a stop sign. We have changed: spark plugs and wires, oil and filter, thermostat, fuel filter, air filter, and the throttle position sensors. and the serpentine belt. any ideas what else to check?

Vacationtime247: You could probably wait a while before doing the gaskets. With just 60k miles on it, I doubt there is any problem with them yet. But around the 100k mark, they should be fixed before going out at an inconvenient time. VT247

Vacationtime247: Rotten egg smell is usually the catalytic converter. Check the spark plugs and ignition system as well while your in there. Hope this helps. VT247

Vacationtime247: Might be the battery is going dead. They don't last forever and will cause a hard start if cranking slowly. If it is the cables, try a wire brush and clean off all the corrosion. VT247

geno gomez: I have a 2000 Chevy Impala. The car is idling up and down and turning off when I come to a stop or make a hard turn. Another forum suggested cleaning the throttle body....

John Paulson: Oh I know I have a leaky intake gasket. There is a bolt on the head just behind the thermostat that always has coolant around it. Oh, and the primary cooling fan will not turn on for anything. When the AC is on the high volume fan runs fine. I have yet to find water in the oil and have been aware of that possibility for some time, so I check it often. Also, I am in a very hot environment and the car has 132,000 miles on it now, so should I consider a different grade of oil. I use high mileage.

Vacationtime247: Twist and turn the spark plug wire boot gently until it spins freely, then pull off at the large rubber end. Sometimes they're stuck good, a set of long needle nose grips works well. Do not pull at the thin wire, always at the boot. If the wire pulls out from the boot it can get difficult. Especially if the metal tab stays on the spark plug wire. VT247

Mike Thexton: Geeze, that sounds like a good time. We just picked up a Honda accord and grand marquis both for 500. Not really having high hopes for the Honda it was kind of a package deal, but the grand marquis looks likes it might be in pretty good shape.
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3400 GM Engine 3.4 Liter Motor Explanation And Discussion