Question about Chevrolet Corsica

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Engine swap Did an engine swap from a Cavalier I believe 97? Into a 95 Corsica. Corsica was an obd1 the Cav engine is an obd2. Should the computers be switched as well? Before the other engine crapped out I was getting roughly 300+ miles to the tank, now I fill up every two days and I that's not even 200 miles a tank. It idles like it's suffocating, or choking, gotta mash the gas to get it going. I didn't do the car being I'm mechanically challenged, but who did is telling me to just start dumping money into parts to randomly replace. It's got a check engine light that comes on, but it's not letting the codes be read?!

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Yes, the computer and engine harness should stay with the engine.
Your old computer is showing that: runs like ****, and won't read codes-as it is, dumping money into parts is very bad advice.

Your quickie engine swap could have used a little planning in advance, a little research. Your mechanic is also a little challenged, if he thought a swap and some minor parts would fix it right up.
If you want the engine to run right, you have to get the engine management computer hooked up right with the right sensors (inputs) and controllers (outputs).
Swappers who do this will refer extensively to a wiring diagram, will often lay out the two engine harnesses and other applicable wiring harnesses (like the computer)-out on the floor, side by side, and then go through them, picking and choosing what they need, the wiring, the electrical connectors, everything they need to make up the right harness that matches the engine and computer. See what I mean by planning?
You will have to start with the computer and engine harness for the new engine. Get the computer wiring harness and connectors, too. Your car's computer and the connectors for it will not work with the new computer. Doesn't sound like your mechanic will be much help, if he is even interested. Don't know what to tell you, Matthew. If you do it your self, better do some research.

Posted on Dec 28, 2013

  • montehammons Dec 29, 2013

    A better idea, less time consuming: find out from a salvager through his interchange database, what years and other models have your identical engine that could be swapped into your corsica, with no or very little (very little!) modifications. Then sell the cav engine and buy that engine (or buy a '97 cav needing an engine-?), ...least amount of trouble swapping: identical engine, and for the most trouble free swap- identical year-then all the electrical connectors and part locations will match up sweet, and no wiring mods to freak out over.

  • montehammons Dec 29, 2013

    Okay, further, I could be challenged myself in my assumption that your two engines, even though identical in size, can interchange-check with an interchange manual for that. There were so many modifications required for the obd 2 systems, I'm not sure. If you need any further advice about taking all advice over the internet with a grain of salt, just ask, lol. No, but check if your '97 is a direct interchange, a candidate for a direct swap.


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Asuming both engines were the same capacity 1.6?1.4? and all parts from first engine were used like air intake/airflow meter etc then original ecu can be used,if all the cavelier parts were used then ecu from donor could be kept with wiring loom etc.poor running could the ecu be running "get u home"mode needs reseting then codes read.if wiring loom from corsa kept are all the sensor wires connected to correct parts of engine?oil temp/water temp/flywheel sensor/oxygen sensor/etc even speedometer all needed for ecu to adj correct fuel air mix for smooth running.was the donor engine running ok b4 its transfer?if u havent already go join an online type website where multiple vauxhall experts will be found to help

Posted on Dec 28, 2013

  • montehammons Dec 29, 2013

    Kev, this Corsica and Cavalier in the US both had a 2.2 L engine, base engine for most Chev. cars in US from about 1990 on for a decade, at least. Good answer, though, correct otherwise. Merry Holidays.



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SOURCE: obd1 scan tool will notaccess

A couple of ways to check and see if the computer is ok first:
check engine light must come onwith they in on position
The fuel pump must run for two (2) seconds with the key ON
There must be a 5 volt reference at sensors like map, TPS
Must communicate with scan tool
The ORANGE wires at the computer are you power input wires one has 12V all the time this is your KEEP ALIVE MEMORY
one is 12 with the Key on you MUAT HAVE VOLTAGE AT BOTH
Check the computers Ground most are out under the hood and are brown wires
Try the GM TAP TEST this is a factory authorized test with the computer connected and you verified all of the above SLAP the computer with the open hand firmly not too hard but firm see if anything changes,
Do not disconnect the battery you will erase all the codes!
Please contact me if you need any additional information.
If you find the information provided helpful please give me a good rating

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SOURCE: 1999 toyota camry

Take it to autozone and have them to pull a code on it.It sounds like O-2 sincer

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SOURCE: toyota seinna po440, po441, po446

you have to understand that there is a leak in the system other than the gas cap for the evaporative system. The system needs to be professionally closed, and smoke introduced into to find the leak, and a through component check, eg.. purge valve vapor canister vent solenoid all functioning correctly

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SOURCE: 95 Oldsmobile aurora rough idle and hesitates, back fires

This has me thinking because its an older car and iam thinking of our europeon models.But if this is a californian model ?? then i would be totally wrong.But to start with i would check the any pipes connected with the inlet manifold,for air leaks ,like the brake servo feed pipe and any small ones that work the fuel vapour thingy or the gearbox.Then if that doesnt work then get a local garage to have a look because a mechanic would have come across this before and would have a good idea what to change without a meter reading .my one suspect is the air flow meter

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SOURCE: Burning smell,check engine light-misfire, rough idle 96 cavalier

Sounds like there is a blown piston, to be sure have a compression test done on that #2 cylinder, if the reading is low, then you'll know.
A friend of mine had a 95 that did simular things only a little more,
it started smoking, dash lights flickered, etc. Finally, he had to get rid of it, the piston rod went through the engine block.

Posted on Feb 02, 2010

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