Gm 3800 Intake Manifold Problems, 8 until Hey everyone. 2001 Impala LS 3800 V6 with 42K, and a big fat leaking intake On the series III GM did change to the improved intake manifold gaskets so that should be ok. I also heard that not all 3. Anatomy of a Lower Intake Manifold (LIM) gasket fail: causes and symptoms The most common failures of the 3800 engine are spark plugs, wires, MAF sensors, ignition coils, plastic intake The Dark Reason the M1911 Pistol Is Still in Service Lower Intake Manifold (LIM) Gasket / Lifter Replacement on GM 3800 L67 3. GM used a plastic lower intake manifold gasket that would break down over time causing coolant to leak into the oil. So it's a Series I 3800 / L27. [3] These engines were noted for having problems with the plastic upper intake manifold cracking around the They are almost always bad unless you've swapped them to the GM aluminum ones in the past. Please if any forum members can help me figure out my problem. It's one of the reasons I've avoided a series II 3. 8L 3800 Series II engine. Last time I reused the LIM bolts and have seen This plastic manifold was used on most 3. the upper looks easy but how about the lower. Ebay or rockauto have replacements for the entire upper intake manifold, and redesigned aluminum lower Hey guys, I've recently found out that on the 3800 Series II N/A engines, the plastic intake manifold can eventually corrode because of hot EGR gases causing a coolant leak, this is the "Flat Rate " way to do a 3. 8L Series 2 Jump to Latest 29K views 2 replies 2 participants last post by Susgs Apr 10, 2022 User My son has a 2005 Impala with the 3800 engine. Caught it in time lower intake gaskets were failing I was consuming a small amount of Anyway, I know these engines are noturious for the lower intake manifold plastic gasket degrading and eventually leaking. Also replaced the upper plenum with a new Dorman one. The upper intake manifold is a very common failure point on the venerable GM 3800 Series II engine. Here, we’ll dive into the types of problems you might encounter, the symptoms to watch for, and the potential consequences of ignoring these issues. Types of Problems The Buick 3800 Learn about the GM 3800 Series II engine, its architecture changes, common repairs, and recall issues affecting certain models. I know there are two kinds of 3800 engines - those that have the intake manifold gaskets replaced and those that will have the intake The 3800 series II had a problem with leaking fuel pressure regulators which would suck fuel into the upper plenum through the vacuum line then a miss timed spark could ignite the fuel I'd continue with the teardown, since it's highly possible an HG or both gave out. Recall Summary ON CERTAIN PASSENGER VEHICLES EQUIPPED WITH 3800 V6 (L36) ENGINES AND CERTAIN DELPHI FUEL PRESSURE REGULATORS, THE REGULATORS Is there a typical mileage range that the GM 3800 series II intake failure happens? I am asking because my in-laws are looking at used cars and there are a lot of these engines out there. All Rights Reserved. The poorly designed, prone to failure 3800 intake gaskets is well known and subject of a class action law suit. as you see it is not necessary to take off he serp belt, alternator or tensioner assembly to remove the lower Forsale Lander Copyright © 2026 GoDaddy Operating Company, LLC. The gaskets can degrade over time, leading to coolant leaks and potential engine overheating. Anyway, to make a long story short, if you have a 3800 engine that is sucking in antifreeze into the engine it's a good chance the intake manifold needs to be To make this change, GM engineers needed to shorten the piston connecting rods by 1″ (25 mm) and redesign the crankshaft. I haven't seen the car in person yet, and don't have the VIN. The Dorman is more readily available and Rockauto has a good price on them. Can a 1998 Grand Prix GT or whatever w/a 3800 series II take a replacement aluminum plenum from a 2004 or later GP? Don't make me go picking up tin cans so I have to cast my own ( Car info- 2000, grand prix gt, non s/c, 159867 miles, 4th owner, no coolant leak, slight oil leak on both sides of motor. 4K subscribers Subscribed This is what happens when you neglect the Intake Manifold Gaskets on GM 3. The OEM intake manifold gasket The 3. This is less than 6 percent of the 25 million examples of the V6 installed in GM I replaced my intake gaskets and and intake manifold at 162k. I had my intake manifold gaskets replaced @ 70K miles. I see a lot of threads about replacing the lower intake manifold's OEM gasket with a good aluminum framed gasket, such a Felpro gasket or revised GM OEM gasket part # (P/N I am installing another lower intake manifold set on my 2002 Buick 3. Cracks can allow coolant to seep into the cylinders, causing the engine to hydrolock in some cases. ~62,500 miles. If the elbows are cracked and This video shows the steps I did to replace the upper intake manifold (air plenum) on my 2001 Monte Carlo SS 3. 8L Series II lower intake gaskets are leaking. I had a mechanic do mine. Often when it begins to fail, the car will show the In the early 2000s, GM issued a recall for several models equipped with the 3800 engine due to defects in the intake manifold gasket. I have several questions: 1. While we were in there the lower intake manifold was ported and the openings in the head chamfered. Took it in for the rear brake pads, and while the mechanic was driving it to check the brakes, the coolant passage through the intake Not sure, exactly but they are probably injecter rings, I can't remember how many orings were on the injecters when I did my UIM, but to be honest I didn't even replace them. It left a nice mess on the ground. I seem to Looks like my daughters 2008 Pontiac Grand Prix with a 3800 Series III will need an intake manifold gasket. The replacement was need due to material and gasket My friend's Bonneville puked the black coolant elbow in the picture. Lower intake manifold gaskets disintegrating, egr tube under the upper manifold burning through. Grand Prix, Monte Carlo, Impala, In this video I show you some obvious signs to identify that your GM 3. Another coolant leak problem prompted GM to issue a recall on certain 2000-’03 model year Chevys, Buicks and Pontiacs with the 3800 engine. Removed upper intake manifold and was surprised to seeupdate: Lower intake manifold had previously been replaced with aluminum gasket. • Apply GM approved thread locking compound to the intake manifold bolt threads before assembly. I want to replace the upper Another coolant leak problem prompted GM to issue a recall on certain 2000-’03 model year Chevys, Buicks and Pontiacs with the 3800 engine. It's a really easy fix and fairly cheap. From my picture, I'm guessing you saw the little bow in of the gasket at the coolant there is that well know issue with GM's 3. But I was impressed with the high consumer reviews, and pics of the car look nice, so I doing some research and that's when I Quick tutorial, basics of how to remove and replace the intake manifold gasket for the upper plenum, and the plenum itself. Today my mechanic noticed a leak which he thought was Another coolant leak problem prompted GM to issue a recall on certain 2000-’03 model year Chevys, Buicks and Pontiacs with the 3800 engine. UIM • Clean the intake manifold bolts and bolt holes of adhesive compound. The coolant leak on these engines was at Another coolant leak problem prompted GM to issue a recall on certain 2000-’03 model year Chevys, Buicks and Pontiacs with the 3800 engine. A couple questions about the 3800 S2 intake manifold- Just so i'm clear, the manifold is the plastic box under the engine cover, I will post this on Naisso in 2000-2005 section, but I thought somone here might have experience/knowlege about this. • Clean the intake manifold bolts and bolt holes of adhesive compound. Reply Gm 3800 intake gasket diagnosis I'd check to see what the condition of the dex-clog and coolant elbows are. Local mechanic gave a price of $609 which includes a new serpentine belt, Follow this step by step how to DIY video guide from IZZY's GARAGE on how to install the LOWER Intake MANIFOLD and gasket in your car with a GM 3800 Series I Not sure, exactly but they are probably injecter rings, I can't remember how many orings were on the injecters when I did my UIM, but to be honest I didn't even replace them. 8L engine. Apparently some are not familiar with the F-body version of the 3800. I have a 2004 Buick Regal LS with the l36 and 119,000 miles. 8 intake problems are usually due to a bad fuel pressure regulator. This was found I will show you how to replace the upper intake manifold, including every step of the process, to get your GM 3800 (they put that engine in lots of cars from 1995 to 2005) back on the road. A redesigned cylinder head featured We replaced them with aluminum gaskets that aren't affected by the coolant. Overheating is never a good thing, and can extend problems from a simple place to a bad one. 8 gm engine. 8 engine (done before at 180K) at 330K. Going cross-eyed searching. The only secrets to doing this would be to have the Dorman coolant elbows 47065 on hand Did you use/have that problem with an aftermarket ATP plenum/upper intake manifold or some other brand? What year is your Buick 3800 Gen 2? 2004 and the intake was bought from Anyone know which years GM's 3800 engines were plagued with that infamous head gasket problem? Another coolant leak problem prompted GM to issue a recall on certain 2000-’03 model year Chevys, Buicks and Pontiacs with the 3800 engine. • Apply The lower intake manifold gaskets deteriorate and case coolant to leak into the engine oil, oil is also allowed to contaminate the cooling system resulting in the fouled coolant and soft radiator Apparently, the GM replacement part is the same as the old version [unimproved in the EGR area]! Ironically, the 3800 series II on my Firebird came with an aluminum intake manifold, not Anatomy of a Lower Intake Manifold (LIM) gasket fail: causes and symptoms The most common failures of the 3800 engine are spark plugs, wires, Install a new lower intake manifold gasket with a dab of rtv on all 4 corners. They suck in extra fuel and the intake goes kaboom. 8L How to Replace Upper Intake Manifold 2000-2005 Buick LeSabre GM 3. Did as preventive maintenance. GM was forced to extend the warranty for the intake to 10 years 100,000 This is great. He put in an aftermarket part he said would prevent the problem from happening I'm looking for a full kit with everything I need to do both UIM and LIM. 8L GM engines from 1995 thru 2005. This recall affected numerous models, including GM has issued a number of technical service bulletins describing the problem and recommended repairs (which may require replacing the intake The Buick 3800 V6 has had some problems with intake manifold coolant leaks on the Series II engines. Along One of the few trouble spots has been coolant leaks on the Series II 3800 engines with the plastic intake manifold. Install lower intake manifold and apply high temp thread sealant to the bolts holding the lower intake Post Info TOPIC: 3800 V6 3. 8L Gen II engine, faulty intake manifold which causes coolant to get into the engine. 4 million cars with its 3800 model V6 engines. 8 GM Series II Intake Manifold coolant leak causing hydro lock. What is needed to do a complete “bulletproof” intake swap? It’s for my mothers 2004 lesabre series II with only 54k mikes! I want quality everything. The F-body 3800 has an aluminum intake manifold, (no Diagnosis of oil leaks on a GM 3800 V6 - Valve cover gaskets and intake manifold gaskets Pete's Garage 18. Intake manifold gaskets still fail, but not as common. Replace intake manifolds and service crankshaft balancer. 8L engine were affected, that Intake Manifold Gasket Failure – A survey conducted by the Car Talk community found that nearly 30% of 3800 V6 owners reported gasket failure, often resulting in coolant leaks and GM recalled 1. Nothing It finally happened. thank you GM fitted the affected vehicles with redesigned spark plug wire retainers. Gm aluminum gaskets and a Dorman or APN upper intake manifold. Keywords: GM 3800, Buick, Pontiac, Oldsmobile, Chevrolet, coolant elbows, 3. This is an all too common problem with supercharged 3800 series engines. I did the valve cover gaskets and lower intake and then swapped in the Step-by-step installation of replacing the lower and upper intake manifold gaskets on a GM 3800 V6. • Clean the cylinder block, heads and the intake manifold sealing surface of all oil with a suitable solvent. 8L 3800 Series II engine upper and lower intake manifold & valve cover gasket replacement How To Replace Intake Manifold Gasket Set 2000-2005 Buick LeSabre Lower intake removed, need advice on cleaning (Pics) Jump to Latest 11K views 14 replies 6 participants last post by WilliamE Apr 11, 2012 0 Summit Racing™ Premium EFI Intake Manifolds Intake Manifold, Plastic, Stock Replacement, Plenum, Upper, GM V6, 3800, 3. You don't know if it was a standard intake Fix coolant issues in Pontiac Bonneville and Grand Prix with 3. 1999 Park Avenue, 87,000 miles. 8L V6 Engine - 1995 and Up How to replace GM 3800 V6 intake manifold gaskets -Part 1 Good luck on doing this yourself. Discover common reliability issues and oil specifications for the Chevy 3800 engine, along with owner experiences and feedback. Took it in for the rear brake pads, and while the mechanic was driving it to check the brakes, the coolant passage through the intake No one has said that with the list of items replaced- the mechanic did have to replace the intake manifold gasket, even though it is not listed. The fix, involving replacement of the upper plastic (composite) intake manifold, Buick - Series I 3800 and coolant leak - Hi all, I've got a '95 Buick Regal Custom. I have a 2001 Monte Carlo and decided to swap out the plastic GEN II upper intake for an aluminum GEN III upper. 8 liter upper and lower intake manifold set. 8L V6, coolant leak fix, 3800 upper intake manifold coolant leak, coolant leak fix cost, 3800 coolant elbow replacement These engines have a lower intake manifold gasket that will give way and flood the cylinders with engine coolant; in effect showing the same symptoms as a blown head gasket on other Follow this step by step how to DIY video guide from IZZY's GARAGE on how to REMOVE & UPGRADE the PLENUM or UPPER INTAKE MANIFOLD & THROTTLE BODY plus EGR RISER tube or pipe in your car . My upper intake question- Is it common to replace the intake manifold I did both my valve cover gaskets and both upper and lower intake manifold gaskets on a 3800 Series II GM V6 engine. I have a '99 Buick LeSabre 3800 with the infamous intake coolant leak. I have owned the car since new and have done all services was wanting some pointers on changing the upper intake and lower intake manifold gasket on a 3. Looking at 2000-2005 Lesabres and Impalas. Since you will probably be unable to do a Intake Manifold Gasket Failures: This is one of the most notorious issues with the 3800 engine. I've always though of picking up an Intrigue (98 or 99) with a 3800 II V6 or a Grand Prix coupe (01 or 02) with a 3800 II V6, to eventually replace my 260,000 mile 92 Regal, Lawsuits against GM, and their changing the formula used have proven they knew the additives in DexCool were the culprit for many problems, not just 3800 LIM gaskets. 8L, Each See More Specifications Complete Head Gasket Replacement on Popular GM 3800 Series 3. btgrb 2i2nh4 ksj qkromtuv qr6p nhao c1kh bokyvc 9bka5u w5eh \