No announcement yet.

Non 3rd gen engine into 3rd gen car


  • Non 3rd gen (DOHC)engine into 3rd gen (SOHC) car

    Just finished up swapping a 01 block/98 head into an 02 SL1 and I figure since there are only 3 years worth of engines that are a direct drop in fit I would document my findings.

    Applies to manual trans only, could almost certainly be made to work with an auto trans.
    01 block
    98 DOHC head
    01 SL2 manual PCM (although any 00-02 DOHC manual PCM should work) this shouldn't be necessary if you're doing DOHC/DOHC
    98 Intake Manifold, fuel rail and injectors
    92 OEM 4-2-1 exhaust manifold (any 5 bolt should be just fine, I was at the JY looking for one and happened to find one of these for the same price so I used it)
    02 SOHC Throttle body (DOHC would probably work if you had the bolts for the 98 intake manifold, I base this on the 02 SOHC TB also having 4 bolts on it and the IAC/TPS part #s being the same) (update 6/2/2017 as I'm doing another one of these - stick with the SOHC TB if the car was a DOHC with vertical manifold before as the throttle cable lengths are slightly different)

    Remove original engine (I remove engine/trans as one) and AIR system
    Install 3rd gen knock sensor
    Remove the 3rd gen injector clips and wire in the older bosch style from your 98 fuel rail, the colors match up nearly perfectly so this should be rather easy... especially with the engine already out of the way) *I could never get 100% confirmation that the 02 injectors wouldn't fit the 98 rail but they didn't look like they fit in far enough so I didn't want to take any chances plus BOSCH pigtails give you more options
    Swap clip off the back of the block where the vacuum line from the TB goes to on the 3rd gen engine
    Reuse 3rd gen flywheel/clutch or change the hydraulics to the earlier design
    If SOHC/DOHC swap get DOHC AC brackets as they are different
    If SOHC/DOHC get new plugs/wires

    Do PCM relearn sequence for your DOHC computer and you should be good to go

    Other observations:
    The air system won't work with the older 5 bolt head.. but I'm not throwing a code for it on this car..
    This may apply to the DOHC to DOHC as well as SOHC to SOHC as long as fuel lines will plug in.


    • paintballmaniac
      paintballmaniac commented
      Editing a comment
      What is the PCM relearn procedure when swapping from a SOHC to a DOHC 3rd gen ECU?
    Posting comments is disabled.



There are no tags yet.

Latest Articles


  • Saturn Coilovers ( Subaru coilover mod )
    by SC2Sick
    11-14-2019, 08:02 PM
  • Saturn S-series Suspension - Lowering Springs
    by SC2Sick
    There are a couple of options for lowering your 1991-2002 Saturn SL SL1 SL2 SC SC1 SC2 SW SW1 SW2 SWP models

    There are good aftermarket struts available from manufacturers like KYB and Monroe that can be combined with several options for lowering springs. This is also a great time to replace your strut mounts as well as they are likely worn out if they have high miles on them. This project will also generally require an alignment afterwards as well.

    Lowering spring options:...
    11-14-2019, 07:45 PM
  • Deebs Build Saturn LL0 engine
    by SC2Sick
    A "Deebs" build is a popular, all Saturn original parts, way to make a performance engine for the Saturn S-Series platform. These parts are easy to source parts that you could easily obtain from a junkyard or salvage yard ( ) that should net modest performance gains without too much difficulty. This can replace a Single Cam ( SOHC ) or be used in place of the later generation Twin Cam ( DOHC ) with minimal additional parts. Generally a computer swap ( see PCM/BCM security relearn...
    01-17-2017, 11:29 AM
  • 3rd Gen SC2 SL2 Universal Window Switch Installation Guide
    by slipstreamconversion
    Writeup courtesy of Megan SC2

    (*please trace the leads with a multi-meter. just trying my untested leads could damage your control board.) My 2002 SC2 power window switches have stopped working, AGAIN! I've cleaned the contacts before which helped but was never a great solution. I never had a way to restore the eroded metal on the contacts, and without fixing the contacts cleaning them was pointless. And who wants to take these things apart again? NOT ME! ...
    09-25-2015, 02:45 PM
  • Removing Cams Without Removing Timing Chain
    Alright, since there has been much speculation and ms paint drawings floating around, I figured I'd post up some real pics of the process. I had to do this today to remove the SDA Race Cams that were
    11-15-2010, 06:11 PM
  • S Series Aftermarket Spring Rates
    Spring Rates: OEM Springs: ............................ 126 lb/in Front, 129 lb/in Rear H&R Race (1.4"F, 1.3"R):.............. 310 lb/in Front, 250 lb/in Rear H&R Sport (1.4"F, 1.3"R):............. 205 lb/in Front, 195 lb/in Rear Eibach Pro Kit (1.3"F, 1.1"R):........ 149 lb/in Front, 91-159 lb/in Rear Progress Group (1.8"):................. 200 lb/in Front, 170 lb/in Rear Progress Group (1.3"):................. 156 lb/in Front, 150 lb/in Rear Sprint (2.0"):............................. 200 ...
    10-01-2010, 12:50 PM