Question about 1990 Chevrolet K1500

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Engine light 1990 chevy truck 350 wouldnt pass smog but was running good.new cat, spark plugs and wires with cap and rotor. now its running like **** and smells like a flooded engine and the engine light came on . checked the timming firing order and the connections every thing looks good . it idels ok but when i give it gas it stutters and feels bogged down. please help im clueless Thanks

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Short the test terminal, and read blinking engine light blinks, count them they will be fast and pause and be fast again each code is 2 digits long. This will help me to solve your problem. Thanks

Posted on Dec 27, 2008

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2 Answers

How to tune up a 1995 Geo Prizm? not passing smog, They told me to tune up and get new cataylic converter, but wont guarantee it will pass smog test.


A tune is just replacing the spark plugs every 100,000 miles and the air filter every 30,000, clean oil is also a help in passing smog, the new converter is what will most likely do the trick.

Dec 28, 2016 | Geo Cars & Trucks

1 Answer

HOW To: tune up Geo Prizm 1995, myself.


wow ,no posted smog report, (the failed gases) now that makes this 10s harder, and for sure more expensive.....
many post,. why not just add to one post
click comments and add.
or edit one. post.
all engines that fail smog run fine. (so says all owners)
(fine means zero,) in the real world.
what's worse is owning a 1995 in USA, and must get sniff tested.
(cant fool that method) no report by you, (paper)

ignore all statements by all smog testers,
only one statement (it fails!)
all others are lies, guessing and BS.
after all if they were fully trained and skilled they'd have a real job.
a fact. (or they get huge retirements from the state?)
The car needs to be check by a pro.
it needs to be scanned, with a custom scan tool that is not sold in any auto store until 1996 happened.

but if that NOT IN THE CARDS./ no money for a real ASE tech?
then yes, do a tuneup..

1: spark plugs. and new wires, cap and rotor.
2: filters. and fresh engine oil, (the oil can be full of gasoline is why)
3: the cat may be ok, is spending a fortune on that good?
on a wild guess,? like your smog guy quipped?
that be your call. no? (shot gun method or testing) your call.

in a shop they would get the engine running perfectly.
in closed loop hot and light cruise.
A NEW front 02 sensor for sure.
then they test the cat last, the CAT is always last.
i think this car has 3 way cat too, so is really 3 cats in one.
all 3 must work. or you fail... (for sure)


what if only NOX gas failed.????
if yes, we fix EGR first. then CAT last. (they work as a team)
what gases failed matters
and was not stated by you.
in a real shop they can sniff front of cat and rear
and tell you ,
bad engine, or bad cat. in minutes.
or both, sure.

bad engine means
1:engine is bad.
2: EFI controls failing, (fuel or spark)
3: misfires. (even some humans cant hear, omg)
4: and many more. but no smog sheet posted, no savvy.

a pro shop knows the pre cat gas levels that are normal.
if they are, then the cat is bad.
end story.

Dec 28, 2016 | 1995 Geo Prizm

1 Answer

Does not pass smog at 25mph


IT FAILED AFTER THE CAT TOO?
NO RESPONSE
SO

POST THE FAILED REPORT
THERE IS NO HELPING ANYONE LACKING THAT.
CO =
HC=
NOX=
-----
IF PRESENT
CO2=
O2=

DATA MATTERS. BIG TIME.

WHY GUESS?
WHY GO BROKE DOING ALL THAT.?


The engine is running real bad.
this is a fact.
due failing with new cat.
so....
scan it yet
and print on all sensors readings?

or ask you mechanic to do that, he knows how.

Jan 11, 2016 | 1995 Jeep Grand Cherokee

1 Answer

1990 GMC 350 engine stops while idling at light. Replaced distributor cap,rotor, spark plugs and cables, new battery. and air filter. Engine is running without missing and no hessitation. Starts strong...


The Idle Air Control runs idle speed, it may be stuck or just bad. its located at the left rear corner of the throttle body, make sure its plugged in.

Dec 06, 2010 | 1990 GMC Sierra

1 Answer

Rough starts and ''service engine soon'' light for 1992 chevy k2500


TO SAVE YOU TIME AND MONEY.HAVE TRUCK SCANNED TO SEE WHAT CAUSES SERVICE LIGHT TO COME ON.YOU CAN GO TO AUTO ZONE THEY WILL SCAN IT FOR FREE.BUT IT SOUND LIKE YOUR O2 SENSORS COULD BE BAD.

Apr 18, 2010 | 1992 Chevrolet C/K 2500

1 Answer

Change plugs and wire and engine will not acclerate. This is a built 350 short block chevy with pro charger.


350 Chevy engine in what? 1990 Corvette? Who built it, did you?

Sounds as though you have plug wires wrong.
Firing order is 1-8-4-3-6-5-7-2

Distributor Ignition System:
Distributor rotates Clockwise. (Rotor)
Find Number 1 tower on distributor cap, go Clockwise with Firing Order.

Distributorless Ignition System:
VIEWING the engine from the Front of the car.

Spark plug wire connections along the back, starting from Left side going to Right side;
2-3-7-4

Spark plug wire connection towards the Front of the engine;
6-1-5-8

(To guess I would say you have 5 and 7 wires switched)

Left side cylinder order is 1-3-5-7, going from front to back.
Drivers side is Left side.
Right side cylinder order is 2-4-6-8, going from front to back.

Oct 13, 2009 | 1990 Chevrolet Corvette

2 Answers

1999 chevy 350 runs rough at idle. #4cyl misfire. light gray build up on spark plug. compression good 180.


You either have a bad spark plug wire or coil pack. The light gray color on plug is normal.

Sep 09, 2009 | 1999 Chevrolet Suburban

3 Answers

1990 chevy 350 distributor wiring diagram and firing order


The firing order is 1-8-4-3-6-5-7-2.
The distributor rotates in a clockwise direction. The engine must be on the compression stroke on the #1 cylinder. Line up the timing marks. Remove the cap and the rotor should be pointing to approximately the 5 o'clock position.

Good Luck

Mar 06, 2009 | 1990 Chevrolet C1500

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