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Old 02-23-2010, 08:45 AM   #1
skii33
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1995 SL2
Default 95 sl2 cranks but won't start

Quick story on car . I bought it about 2 months ago . Lady said it was going down the road ond just died. My background on saturns : I have fixed up about 55 of these cars and have built motors for most of them (among other problems fixed). This one has me stumped so far . I pulled the motor rebuilt it and put it in another car , now i built a motor for this one and can't get it to run. Here is what i have done so far ....new plugs and wires , new ects, new fuel filter. There is spark to the plugs, there is at least 45 psi of fuel pressure to the rail ( best i can tell with my makeshift fuel pressure guage) the timing chain is lined up right , all fuses are good , and the injectors are from a 95 ( i know they changed the impedence in 960..IT should run. I tried to get it to run before i pulled the engine but couldnt , other saturn projects came up and this one sat on the back burner for three months . It is a 95 sl2 with 197,000 miles . Could the computer be sending the spark at the wrong time or not firing the injectors ? Before i changed the engine i tried a crank sensor , spliced in a new connector for the ects, tried a coil pack, cleaned the throttle valve. The car will try to start like it is firing but wont. I am an experienced 50 year old mechanic who used to work at a buick/chevy dealer in the 80's for 10 years . Sorry for the bad writing but im not much of a story teller.Any and all suggestions will be a blessing thanks Glenn

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Old 02-23-2010, 09:02 AM   #2
Cheyne
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2000 SL2
Default Re: 95 sl2 cranks but won't start

Have you tried cranking at WOT or pulled the plugs to see if they're soaked with fuel?

I'm wondering if the splice on the ECTS connector is good. You could put a scan tool on it and see what the PCM reads as the coolant temp.

You did change the ECTS that feeds info to the PCM, correct? The 95 has 2 sensors.

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Old 02-23-2010, 10:07 AM   #3
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Default Re: 95 sl2 cranks but won't start

Although there may be pressure at the injectors, you might not have any injectors firing - either power is missing to all the injectors or some/all are clogged(?). There's a main injector fuse and 12v should be sitting on one side of each injector connector. The other wire goes back to the pcm for grounding; this pulsed signal ground provides the pulse needed to open each injector. Another way to check for injector pulses is smelling the plugs for fuel since the cylinders should be wet with fuel from all the cranking.

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Old 02-23-2010, 11:05 AM   #4
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Default Re: 95 sl2 cranks but won't start

Pull the front o2 sensor out and see if it will start.

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Old 02-23-2010, 11:35 AM   #5
skii33
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1995 SL2
Default Re: 95 sl2 cranks but won't start

I did try to start it while holding the throttle open. and yes the splice at the ects is good and yes i do have it hooked to the bottom sensor (i'm aware of the other sensor for the guage on a 95). I do have power to the red wires at the injectors. The plugs are getting fuel (they are damp with fuel). removing the o2 sensor and cranking? what will that do?

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Old 02-23-2010, 08:51 PM   #6
skii33
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1995 SL2
Default Re: 95 sl2 cranks but won't start

the winner is bluesl2!!!!! At first i didnt understand pulling the front o2 sensor , then it hit me , plugged exaust. The inside of the converter came apart and pluged the midpipe and muffler . MY old rule was an engine needs 3 things to start : spark, fuel, and compression . My new rule includes these three plus a place for the exaust to go . I have never had a plugged exaust cause an engine to not run, i have had plenty of semi plugged exausts make a car run bad , but not start? thanks to all Glenn

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Old 02-23-2010, 09:45 PM   #7
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Default Re: 95 sl2 cranks but won't start

removing the o2 sensor and cranking? what will that do?
That is what I was thinking also-I learned something today by just reading your post.

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Old 02-23-2010, 10:02 PM   #8
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1997 SL2
Default Re: 95 sl2 cranks but won't start

IIRC, a plugged exhaust can cause low compression.

...
97 SL2
DOB: 3/19/97
Date Obtained: 5/30/07
Status: Alive, 1/2 exhaust

2004 Merc G.Marquis GS
DOB: 2/4/04
Date Obtained: 7/6/12
Status: Alive, no heat

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Old 02-23-2010, 10:51 PM   #9
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Default Re: 95 sl2 cranks but won't start

Actually, the engine can't breathe. An engine is basically just an air pump. Depending on how bad the converter plugs, you could have varying issues, no start, lack of power, etc. I've seen cars before that start but will barely accelerate. Glad the problem is figured out.

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Old 03-31-2010, 09:02 AM   #10
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Default Re: 95 sl2 cranks but won't start

Can someone explain this to me? How does removing the O2 sensor "un-plug" the exhaust? And how the heck did it get plugged to begin with?

Thanks,
J

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Old 03-31-2010, 09:24 AM   #11
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Default Re: 95 sl2 cranks but won't start

Read post #6 and Google catalytic converters; how they work and their construction.

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Old 03-31-2010, 09:35 AM   #12
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1996 SW2
Default Re: 95 sl2 cranks but won't start

Removing the O2 sensor acts as a "tracheotomy", allowing the exhaust to breathe out through the bung hole.

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Old 04-01-2010, 01:46 PM   #13
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Default Re: 95 sl2 cranks but won't start

Ok, so the O2 sensor lets it breathe through its (now vacant) hole, and the cat convertor collapsed or something to stop up the exhaust in the first place.

right?
J

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Old 04-01-2010, 04:43 PM   #14
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Default Re: 95 sl2 cranks but won't start

The vacant hole that was occupied by the O2 sensor now allows exhaust gases an alternate exit hole if the catcon is clogged from a deteriorating honeycomb structure falling apart.

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