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Old 06-10-2015, 02:12 PM   #1
corynoack
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Default Help 93 sl1 won't start

I am having trouble with a 93 sl1 that won't start I had to rebuild the motor because the timing chain guides fell apart.the motor has been rebuild and installed I try to start it it turns over has spark is getting fuel but it won't fire up and run I really need some help
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Old 06-10-2015, 02:36 PM   #2
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2003 L-Series 3.0L Sedan
Default Re: Help 93 sl1 won't start

Welcome to Saturnfans! Your '93 is an S-series where posting in the S-series tech forums will give you more help. Just repost again in the S-series tech section and let this thread die on its own.

A short list to work on;

1-Is the two wire original round nosed coolant sensor still in use or the correct flat nosed brass one? The old one tends to fail, flood and/or run the engine rich all the time. The 1/4 scale temperature needle position is a clue.

2-Removing spark plugs after failed starting attempts should show soaked plugs with fuel. Yes or no?

3-If several starting attempts don't work (fuel and spark seen), a flooded engine can be started by holding the gas pedal down/wide open throttle telling the pcm to shut off fuel injection while starting. More air will dilute the flooded engine until it sputters to life.

4-If fuel isn't soaking plugs, there's a main injector fuse that may be blown or a possibility of a worn out fuel pump.

Does your engine use four injectors or a single throttle body injector (TBI) at the rear of the engine?
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Old 06-10-2015, 03:05 PM   #3
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Default Re: Help 93 sl1 won't start

1 I think it is the original coolant temp sensor
2 the spark plugs are dry and it uses the single fuel injector and has good fuel pressure
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Old 06-10-2015, 03:35 PM   #4
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Default Re: Help 93 sl1 won't start

Remove the coolant sensor, the two wire one, and examine it. Its either a round nosed plastic one or the flat nosed brass one. Brass is the only correct cure for this one problem. Even without fuel on plugs, replace it if it's the old one.

Dry plugs suggests either a fuel pump/pressure or pcm/injector problem. Older Saturns may have a fuel test valve hiding somewhere. Most modern EFI systems have shiny steel fuel lines running across the tops of engines with a 'T' fitting, a fuel test valve similar to tire valves. Fuel test valves can be depressed to see if fuel squirts out or connecting a fuel pressure gauge for accurate measurement of pressures.

A TBI using one main injector may either leak from years of reliable use or fail outright. A spark test ensures the pcm is working but can't tell you if the injector signal is working, wiring is damaged, a leaking injector is flooding the engine or the injector died. Someone starting the engine while you look down the TBI should show fuel spraying out the injector. A worn out fuel pump (mileage?) can be tested by a small wire jumper across the fuel pump relay terminals 30 & 87; this sends 12v to immediately power the pump for troubleshooting the fuel system.
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Old 06-10-2015, 03:44 PM   #5
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Default Re: Help 93 sl1 won't start

The injector sprays the fuel pump works I guess that just leaves the coolant temp sensor
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