Question about 1999 Saturn SL

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Idles rough and than dies. runs good down the road. installed new spark plugs. ran diagnostic test, no codes. can u help??

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I would check the ends of the medium sized rubber hose that goes to the brake booster from the inlet manifold, as well as all those pesky little rubber vacuum hoses that are used for pollution control. They tend to go hard and split where they connect to the metal piping if they are over 10 years old, allowing air / vacuum leaks into the inlet manifold which upsets the idle mixture causing rough idling.

Posted on Sep 03, 2010

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Posted on Jan 02, 2017

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1 Answer

Car won't start


why ignore the CEL??????
you cross over the spark wires. lost firing order.
its not PVC but is due.
sure, lost spark, lost spark time, crossed wire.
if spark is good try test fuel
clean the EGR, if it sticks open car will never idle fast.
and will stall.
clean the ISC do the ECU can in fact now control idle.

you are are on track, most here are not.
you did a tune up, that is good , and is first.
bad fuel, car parked for year, dead?
now the 1 question, (after it runs)
can your happy right off save the stall
only this counts..... 1st....

check firing order now that wires are scrambled.
then check for spark on all 4 cyl spark wire ends.
then if spark is good,
and compression, good, 150 not 80psi
you do know this is and inteference engine right? and if not
fresh timing belt the engine will grenade. for sure.
dont listen to dorks telling you, mine didnt, they are idiots.
if you like Russian roulette ? and $3000 new motors are joy?
then skip the belt.

that finishes off a 60k turn up, spark , filters and da belt.
then spark timing.
then fueling.

all the fuel in the world is useless on a dead motor or dead spark'.

fueling is last.
if motor and spark are good, then yes, fueling
try test fuel (spary)
if that works for duration of spray
then check fuel pressure
that be next.
and more... ask

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I had 2 experiences like that. 72 ford pickup I was watching it try to run after I got home from work. It was dark and I could see sparks. I also noticed the coil was very hot. I changed to coil and all was well. I had a 94 sunbird it ran good at high speeds but I could not keep it running at a stop sign or stop light. I change the plug wires. I had not code. I suggest you check the code if you have a check engine/warning light. It can help narrow your search.
I don't even remember if the 72 had codes back then but I have learned to check them any time I have a check engine light.

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Older post...but, just in case you haven't found anything this is a great article.
http://www.off-road.com/toyota/tech/codes/index.html

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Sounds the EGR valve and EVP sen is bad even if you tested it. The EGR valve cntrols idle and if carbon up will make the car stall or idle high and low (rpms going up and down) This was common on all cars during that time. I would say replace the EGR valve and senosr. This should take care of the problem. One more thing have the fuel pressure check on the car.

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The intake gaskets leaking would cause the engine to have a misfire. Get a can of Brake Clean and spray in around the intake manifold on the top of the engine while the engine is running. The engine idle will go up or down if there is a leak. Also try swapping the spark plug with another spark plug to see if the misfire moves to another cylinder. If it moves then you have a bad spark plug. I hope this helps.

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My problem was solved when I repaired my 4 wd activation dash switch. The switch was contacting on 2WD & 4HI at the same time. The front differential activation is vacuum activated possibly creating a tug of war that didn't actually engage it but drained off vacuum from the engine? A theory at best but stumbbled across it because I knew the switch wasn't working properly I repaired it and low and behold rough idle disappeared and all is good for 3 weeks running.

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