96 saturn

TONY123 · 08-07-2007, 08:20 PM

hello everyone im 17 and i just rebuilt my engin dohc 4 cylder,5 speed and it runs but sometime it will stall the bigest problem is that it has a misfire in the engin and i cant firgure it out

plz help me

bry623 · 08-08-2007, 07:52 AM

I have a 98 Saturn.

Mine misfired and we had to change plugs and clean out where you screw them in.

TONY123 · 08-08-2007, 08:14 AM

okll try that thank u

**qldit** · 08-09-2007, 06:50 PM

Good Morning TONY123, it is common for aged sparkplug leads to cause misfiring, as you will notice they usually do not have actual wire inside them but various forms of conductive resistive substance.
With constant vibration these leads often generate open circuit sections and cause erratic running, especially when the engine is under load.

Commonly when this problem exists it can cause arcing inside the distributor cap or coil pack, so it is worthwhile considering routinely replacing these leads, even as a preventative maintenance procedure every 5 years or so, dependent on how well they are supported.

In engines where the spark plugs are buried deep inside the head (where the leads enter insulated tubes and go through the rocker cover) the plastic insulators also often break down, especially where sparkplugs are never changed. (the gaps become enormous so the high voltage seeks an easier path)

You can normally measure the actual resistance of these leads with an ohmmeter to get an idea, and carefully inspecting the insulating tubes for cracks caused by arcing are tell-tale.

When faulty leads are common, it is also common to find ignition modules (pointless igns when used) are adversely affected.

You have done well with a DOHC engine, some of them can be very complicated.
How did you time the cam, using a manual?

Cheers, qldit.

TONY123 · 08-09-2007, 11:45 PM

no ive done them before there are dots on the cams and the crankshaft u have to line them all up that u put on the chan ect. ect. my stepdad has a degree in engin performence and we have been working on engin together seen i was about 8 this was the frist one i did by myself im scared i still have a braket but other then the misfire its running great i had the heads cleaned and inspeced change everything except the block lol so i dont think it could be a spark plug i think i might have put them on the wrong way tho i number them and i think i put them on wrong thank u u made me think of that
in need of help
tony

**qldit** · 08-10-2007, 06:53 AM

Good Evening Tony, the normal firing order for a 4 cylinder is 1342, if you have any crossed over it will normally still run but have low power and an erratic misfire which is constantly present.
You only ever get caught once with this! LOL!! (Don't ask me how I know this!!)
Well done with all the work, as a cam timing back-check TDC should be present with 1 or 4 cylinder valves perfectly "rocking".

How did you go setting all those tappets? That is a pain of a job!

Cheers, qldit.

08-07-2007, 08:20 PM	#1 (permalink)
TONY123 Registered User Join Date: Aug 2007 Location: bradenton fl Posts: 8 OS: XP	96 saturn hello everyone im 17 and i just rebuilt my engin dohc 4 cylder,5 speed and it runs but sometime it will stall the bigest problem is that it has a misfire in the engin and i cant firgure it out plz help me

08-08-2007, 07:52 AM	#2 (permalink)
bry623 Manager, The Conversation Pit/Analyst, Security Team Join Date: Apr 2002 Location: NW Territory circa 1787 Posts: 11,692 OS: winxp pro sp2	Re: 96 saturn I have a 98 Saturn. Mine misfired and we had to change plugs and clean out where you screw them in. __________________ "If you aren't a liberal when you're 20, you have no heart. If you aren't a conservative when you are 50, you have no brain"

08-08-2007, 08:14 AM	#3 (permalink)
TONY123 Registered User Join Date: Aug 2007 Location: bradenton fl Posts: 8 OS: XP	Re: 96 saturn okll try that thank u

08-09-2007, 06:50 PM	#4 (permalink)
qldit TSF Gearhead Join Date: Mar 2007 Location: Brisbane Australia. Posts: 592 OS: All Systems, mainly Linux	Re: 96 saturn Good Morning TONY123, it is common for aged sparkplug leads to cause misfiring, as you will notice they usually do not have actual wire inside them but various forms of conductive resistive substance. With constant vibration these leads often generate open circuit sections and cause erratic running, especially when the engine is under load. Commonly when this problem exists it can cause arcing inside the distributor cap or coil pack, so it is worthwhile considering routinely replacing these leads, even as a preventative maintenance procedure every 5 years or so, dependent on how well they are supported. In engines where the spark plugs are buried deep inside the head (where the leads enter insulated tubes and go through the rocker cover) the plastic insulators also often break down, especially where sparkplugs are never changed. (the gaps become enormous so the high voltage seeks an easier path) You can normally measure the actual resistance of these leads with an ohmmeter to get an idea, and carefully inspecting the insulating tubes for cracks caused by arcing are tell-tale. When faulty leads are common, it is also common to find ignition modules (pointless igns when used) are adversely affected. You have done well with a DOHC engine, some of them can be very complicated. How did you time the cam, using a manual? Cheers, qldit.

08-09-2007, 11:45 PM	#5 (permalink)
TONY123 Registered User Join Date: Aug 2007 Location: bradenton fl Posts: 8 OS: XP	Re: 96 saturn no ive done them before there are dots on the cams and the crankshaft u have to line them all up that u put on the chan ect. ect. my stepdad has a degree in engin performence and we have been working on engin together seen i was about 8 this was the frist one i did by myself im scared i still have a braket but other then the misfire its running great i had the heads cleaned and inspeced change everything except the block lol so i dont think it could be a spark plug i think i might have put them on the wrong way tho i number them and i think i put them on wrong thank u u made me think of that in need of help tony

08-10-2007, 06:53 AM	#6 (permalink)
qldit TSF Gearhead Join Date: Mar 2007 Location: Brisbane Australia. Posts: 592 OS: All Systems, mainly Linux	Re: 96 saturn Good Evening Tony, the normal firing order for a 4 cylinder is 1342, if you have any crossed over it will normally still run but have low power and an erratic misfire which is constantly present. You only ever get caught once with this! LOL!! (Don't ask me how I know this!!) Well done with all the work, as a cam timing back-check TDC should be present with 1 or 4 cylinder valves perfectly "rocking". How did you go setting all those tappets? That is a pain of a job! Cheers, qldit.