Question about 1996 Saturn SL
We have changed spark plug wires, spark plugs, ignition mod, coil, computer, map sensor, egr valve, compression checked good. still missing when you slow down. Sometimes low power going up hill.
Saturn ? this is a 4 cyl 16v engine similar to the ones used in our opel range here in europe and these engines suffer from computer problems big time and your one is showing the classic signs,now look at the front pulley and see if their is a unused mounting on the top left side of the pulley where on older engines their would be a crank sensor with a toothed ring around the pulley and if so and yours has the sensor on the cylinder block rear flywheel end then disconnect this sensor and get one from the earlier model that fit at the front and connect it to the wires that go to the rear sensor ,now if its the same then reverse the two wires as this makes a difference and it should run as sweet as a singer sowing machine without a new computer which is bolted to the inlet manifold .If it is then unbolt it making sure it has a earth wire to the casing and pull it away from the manifold then install a small comptercooling fan to the casing with a couple of thick plastic ties and wire it in to the ginition circuit somehow .and make sure its supported away from the manifold to reduce the heat it gets and i promise this will work as i do about at least one a month of this type engine although mine are a bit later than this year but have a look and see if iam correct about the crank sensor .
Posted on Dec 31, 2012
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Posted on Jan 02, 2017
SOURCE: 2003 saturn vue came in
You need to forget what you have already done...This is going to just mess with you. Pretend that you have never seen this vehicle before and start over with the codes. I gater from your description that you are dealing with a 3.0L Dual Overhead Cam V6.
I also gather that you are getting codes P0301, P0302, and P0305.
If I am "gathering" correctly, this places your problem on all the cylinders on the rear head. Check all your plugs and make sure they are gapped properly. Check to make sure that your injector connectors are plugged in. (You did say you had the heads off) Check to make sure that your coil connectors are plugged in. If you are sure that everything is plugged in properly, test coil pulse at each coil connector with a test light. Test for injector pulse at each injector. I have seen some of the Saturns with a separate connector for the rear-head coils and injectors. If this one is equipped with that, make sure it is plugged in properly. If this does not turn up the problem, retest your compression on the rear head. If the compression looks OK, go ahed anyway and recheck the valve timing. You could be one tooth off on the rear head and it won't be bad enough to affect compression during a cranking compression test, but enough to cause misfires with the engine running.
Don't fall into the trap of "I already replaced this" or "I know I did this right - no need to recheck". I have seen thousands of dollars worth of parts replaced unnecessarily due to this. CHECK EVERYTHING AGAIN! Like I said at the beginning of this, the best way to handle a problem like this is to pretend you are trying to figure this out for the first time. The only thing you know is that "someone" had the heads off. Other than that, you don't know anything.
If none of this turns up a suspect, post a comment to let me know.
Posted on Feb 04, 2011
SOURCE: Cylinder 3 mifire, I have
Have you run a compression test of the engine? Have you confirmed you have spark at #3? Is #3 no more than 5% lower than the highest cylinder reading in PSI? ALWAYS run the basic tests before throwing parts at the problem. Also does the injector "pulse" and deliver fuel? When you pull the #3 Spark plug out after cranking the engine does it smell like gas?
Posted on Jun 06, 2011
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