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1991-1997 DOHC

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  • 91-95 Plenum Removal

    91-95 Plenum Removal

    I did this on a 94-95 engine but aside from a few minor vacuum lines the instructions should work. 1. remove the plastic engine cover 2. unbolt the plenum to lower intake 10mm bolts 3. take the 2 rear mount nuts off, they are on the rear of the plenum by the spark plug wires 4. take the intake arm/tube and airbox/cone filter off 5. unhook the cables from the throttle body. It is easiest if you slide the plastic clips off of the metal mount. 6. take the 2 small screws holding the metal transmission vacuum line to the fuel rail (I did not put these back on) 7. pull the metal vacuum line and the plastic line off of the plenum (91-93 may have a diff...
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  • Oil Pump Drive Quick Fix

    Oil Pump Drive Quick Fix

    I have done this myself it was fairly easy it took about 6 hours, but I was in no way hurrying. 1. Remove the air filter elements. (Use a flat head screwdriver) 2. Remove the plenum. (You will need a 10mm and 13mm socket, and a pair of vice grips.) 3. Remove the 4 bolts holding down the fuel rail, remove the thin metal rail running along the top of the fuel line. Pull up and the injectors should simply pop out. 4. Remove all electrical connectors on the harness for the fuel rail, (3 by the ECM, Cam Position Sensor, The sensor behind plenum, and coolant temperature sensor) and then swing the riggins ou...
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  • Cam timing text walkthrough

    Cam timing text walkthrough

    If you do not have the cam hold down tools, Go here to make your own. Take o*nly front valve cover off. Remove the front plug wires and the four bolts across center and o*ne for the plug wire retainer. Next find a bolt that will thread into the hole between the cam lobes at the far left. This bolt will be 2.5 inches by 7/16 in. I think. Put the valve cover back o*n to drive to the store to get some bolts if needed. If not remove the oil from the threaded hole first before threading a bolt in. When you get the right size bolts here's where we start. My car is a 92 Z34 5 speed maybe all will be the...
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  • Cam Timing Picture Walkthrough

    Cam Timing Picture Walkthrough

    The following pictures and directions should be used as a general guideline and in no way represents every year/modification. I will have a page of all the motor torque specs soon.

    You will want to replace EVERYTHING when you replace the belt. It costs more now but it will save you time and more money later on.

    timing belt - 24502982

    tensioner pulley - 24503561 bolt - 10162013

    idler pullies - 24503859 bolt- 11514441

    tensioner actuator - 24503860



    Remove 2 10mm nuts for fuel rail cover

    Remove Intake filter hose and PCV hose

    Remove 2 8mm bolts for spark plug wire front cover. Also front valve cover vacuum line.

    Unplug MAP sensor wiring and 2 plastic vacuum lines, 1 facing the front, one facing the rear. Pull metal vacuum line now if you can, otherwise it can wait till the plenum is unbolted.

    Remove the throttle cables from the throttlebody.

    Remove coolant overflow, 1 10 mm bolt and 1 10 mm nut

    Remove front spark plug wires

    Remove front and rear timing belt inspection cover (2 8mm bolts)

    Remove 7 10mm bolts holding plenum down.

    Remove PCV valve to plenum
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  • Make your own cam hold down tools

    Make your own cam hold down tools

    The specs for my home made tools = 1/2" x 1/2" x 6" key stock with 5/16" hole in center. Bolts are M8 x 1.25 x 50mm, two washers are needed on each. Sorry about the dark pics, flash was not working for some reason.

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  • LQ1 Service Bulletin 57-61-09 Lifter tick (cold)
    Dug up the GM Service Bulletin for "Lifter tick when cold", 57-61-09. '91 to '95 LQ1 (VIN X) The parts kit has been discontinued by GM long ago. My quest was to find sources for those parts; and complete the procedure on my '93 Lumina Euro 3.4 which was torn apart to replace the rear head gasket. There are three critical part numbers in the GM service kit (aside from gaskets and O-rings) required to perform this operation. Two of the three are readily available in the aftermarket--the 10-32 set screws, and the cup plugs. I hadda buy a box of cup plugs and a batch of set screws; if you can't find 'em locally, send me a PM. All gaskets 'n' seals are readily available, and are included in the gasket set I needed to replace the head gaskets (Fel-Pro HS9113PT1 Head Set.) This leaves one item that is expensive to source--the replacement thrust plates. Reading the bulletin, and...
    03-02-2012, 02:48 PM
  • 3.4 DOHC Heads on a 3x00 Block
    Several people have talked about the possibility to use the 3.4 DOHC heads on the 3x00 engines. Some for performance, and some for replacment, where getting a 3.4 DOHC block might be difficult, but getting a 3400 (or even a 3100) block might be easier to come by.
    For these test fittings, I used a 1994 3.4 DOHC BLOCK, a 1994 3.4 DOHC REAR head, a 1999 3100 SFI BLOCK, and a 1996 3100 SFI head.
    This article is broken into 3 sections.
    • The first section is BASIC COMPARISONS where I compare the BLOCK of the 1994 3.4 DOHC, and the 1999 3100 SFI.
    • The second section is a 1994 3.4 DOHC head on a 1999 3100 SFI block.
    • The third section is a 1996 3100 SFI head on a 1994 3.4 DOHC block.

    This is the BASIC COMPARISONS between the 1994 3.4 DOHC, and the 1999 3100 SFI.
    This is a bare 3.4 DOHC block
    And this is a bare 3100 SFI block
    One of the biggest NOTICEABLE differences is the OIL VALLEY. The 3.4 DOHC does not have lifter holes, and it has a cover on it. When the engine is ASSEMBELED, the valley is actually OPEN to the air, and not sealed off like the 3100. The 3.4 DOHC has that cover on it to keep anything from getting in there.
    Here is the cover on a 3.4 DOHC
    This is me holding the cover in place on a 3100 block
    This is page 2 of the 3.4 DOHC heads on the 3x00 block. First of all, this is a 3.4 DOHC HEADGASKET on the 3100. Sorry it is so blurry, but the items I want to point out, I have more pics of. This is the first glaring difference (other than the oil valley). as you can see, half of the coolant ports are OPENED UP to the exterior of the block. If you go up to the first 2 pics, you can see the coolant passages around the cylinder. The 3.4 block is thicker and has an extra cooling port. Now this is the 3.4 DOHC HEAD on a 3100 block. The coolest thing is that it DOES BOLT RIGHT UP. I only have 2 bolts holding it in, but they are the same fitment. Now for the inconsistancies. First of all, this is looking at the INSIDE area of the engine. The 3.4 DOHC has oil passages to feed the oil back into the block. This is not really a problem on the 3100, however you would have to make a cover for the lifter ports that also allowed the oil return for the heads. This is the underside of the 3.4 head on the 3100 block from. You can see that it overhangs too much, and the coolant passages are exposed (you will REALLY see this later on in the 3100 head on 3.4 DOHC block pics) Here is a closeup of the exposted coolant port. Now here is a HUGH problem. Here is an exposed OIL PASSAGE for the head. You can see that the 3100 block has NO provision for this at all. Keep in mind that the 3.4 DOHC has to flow a LOT more oil than the 3100 because of th
    01-20-2011, 12:08 PM
  • 3.4L (DOHC) Specifications
    06-15-2010, 05:56 PM
  • OBD2 Tuning 3.4 DOHC
    The 97 4T65 in the Monte Carlo is almost bullet proof. I have been beating the crap out of my reman with my blower now for 2.5 years of daily driving vs the 60 NA that I couldn't get 1 year out of. 4 Trans in 50K miles. I'm a violent offender. Overfilling and royal purple atf are my secret. DHP will do 96 and 97 DOHC tuning, HPTuners only works with the 97 computer. 96 can not change line pressure, 97 can. 97 bin is double in size of the 96 bin. They changed every thing and it has every table that the 97 GTP has, includin...
    04-17-2010, 04:53 AM
  • 3.4 DOHC Pistons
    Here is the TRW catalogue spec sheet for the 91-95 as well as the 96/97 pistons.

    TRW 3.4 DOHC Pistons
    Silvolite 3.4 DOHC Pistons Notice that the 96-97 pistons don't have as much compression distance but also have a dome to them. I dont know the exact amount of compression loss you will get when using these pistons with the 91-95 heads, but it goes against the common belief that 96 pistons raise compression. The Silvolite pistons are the EXACT pistons used in the 91-95 automatic. They do not list the 5 speed pistons which would rai
    04-14-2010, 01:23 AM
  • 96/97 3.4 DDOHC Intake Manifold Swap for 91-95 Engines
    Pictures can befound here * Need to find this album * Having just completed this swap myself and being MORE than impressed with the results, I felt the need to write up how to properly do this swap so everyone else can do it easily: First off, here are the major components you will need from your donor motor: Upper Intake (Plenum) Lower Intake and fuel rail ’96 Rear Cam Carrier Cover (Valve Cover) Intake pipe Throttle Body (Stock or whatever, but I recommend you start with a stocker) ’96 Plenum bolts (Trust me, they are different, Upper AND Lower) Plenum to intake pipe support bracket EGR Valve or blocker plate if Ben turned your EGR valve off Exhaust manifold to EGR pipe ’96 Throttle Cables (This is debatable, ‘92 will work with some modding, but the cruise cable will NOT ’96 Coolant pipe that runs from the water pump junction across the front of the motor to the lower intake. A new O-ring for that can be gotten at any auto parts store, I used a ½” I.D. Ύ” O.D. O-ring, it goes on really difficult, but will seal awesome. You’re also going to need new gaskets and vacuum lines. I have included descriptions and part numbers here: 12538693 - ’96 Intake gaske...
    04-14-2010, 01:20 AM