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Old 07-06-2016, 03:41 PM   #1
isaiah38brown
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1997 SC2
Dizzy 97 SC2 with code p0300 and p0340

hey guys i just bought this car. it has been sitting for awhile and didn't run when i bought it. i got it to start and run but runs bad. motor jumps around everywhere it has a misfire and also it smokes really bad. (white smoke) doesn't smell like coolant more smells like gas. i have changed plugs, wires, cleaned the coils up (haven't replaced or tested because not sure how) and also coolant temp sensor. i am in need of help and not sure what to do next. so anything would be great! has pending codes p0300 and p0340

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Old 07-06-2016, 07:18 PM   #2
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2003 L-Series 3.0L Sedan
Default Re: 97 SC2 with code p0300 and p0340

1-Mileage?

2-How long was the car sitting unused?

3-If a partially blocked catalytic converter occurred from the car sitting for months, a quick test would be removing the front O2 sensor and seeing if the engine suddenly has renewed power.

4-If engine mounts are trashed, search for how check them.

5-A spark test is easy; after noting firing order, remove plug wires and have someone crank the engine - spark should jump across both coils. The condition of the old plugs may have given a hint of overall engine health before they were replaced.

6-Cleaning throttle may help.

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Old 07-07-2016, 06:34 AM   #3
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1997 SC2
Default Re: 97 SC2 with code p0300 and p0340

the car has 191,000 miles and was sitting for two years. did a compression test and that checked out very good all around 180. when i got the car the main wiring harness had been chewed through and i fixed all the broken wires i could. my main concern is the smoke and how to stop that. thank you very much for short reply. also would the bad motor mounts cause it to misfire/run very poor? they looked bad but i wanted to get running before putting more money into it

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Old 07-07-2016, 11:57 AM   #4
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2003 L-Series 3.0L Sedan
Default Re: 97 SC2 with code p0300 and p0340

This was a one time experience where a car was left garaged for several years unused back in the '80's. After a gummed up carburetor was disassembled and cleaned up, the engine roared to life and was driven daily prior to selling it. About a week or two went when power was lost - a direct result of the catalytic converter rotting away in the garage and disintegrating internally while driving until it blocked exhaust flow. Replacing the catcon restored engine power as exhaust was allowed to flow.

Two years as a lawn ornament and you repaired chewed up wiring (critters?) may be one hint of several problems not uncovered........ Bad motor mounts simply allow the engine to shake but with damaged wiring, anything possible. Under normal circumstances engine shake doesn't affect engine running. White smoke or usually associated with overnight condensation in the exhaust system. When the engine starts up and there's humidity, condensation heats up and turns to steam as excess moisture is cooked in the exhaust system, leaving the tail pipe. Steam goes away after a few minutes as the exhaust system reaches operating temperatures. This is seen in winter or on cool mornings with high humidity.

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Old 07-07-2016, 02:58 PM   #5
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1997 SC2
Default Re: 97 SC2 with code p0300 and p0340

The smoke is bad enough to fill up the car if you start it for a couple of seconds. although unplugging o2 sensor helped it did not fix the problem. the smoke is definitely gas so what components should i check for too much gas. could it be injectors/injector order? still very confused because there is not many codes except random misfire and camshaft which sound like they are related.

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Old 07-07-2016, 03:28 PM   #6
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2003 L-Series 3.0L Sedan
Default Re: 97 SC2 with code p0300 and p0340

Connect a fuel pressure gauge (Autozone loaner?) before the next engine startup so you can monitor pressures. '97's have a peculiar problem of bleeding off pressure (faulty pump check valve) as soon as ignition is turned on where all other EFI system pressures remains with little bleed off. Everyone with a '97 simply turns on ignition, buckle up and proceed to starting without issues.

With the engine running, what's fuel pressure? What may make this difficult to troubleshoot a leaking pressure problem is the '97's problem of bleeding off pressures. An injector or fuel pressure regulator leaking can be seen as a drop in pressure in most engines. You'll probably have to check injector leaks by removing spark plugs to see which one is black; excessive fuel won't burn completely and blacken plug ceramic noses. Dry sooty black is excess fuel, oily black is due excessive oil burning with blue exhaust smoke. Worse case scenario is removing the injector rail to examine injectors, maybe reconnecting them to fuel and turning on ignition (engine off) to see if fuel leaks out any injector when the pump pressurizes.

Examine the coolant sensor connector for corrosion; anything to make poor electrical connections can create a rich fuel mixture condition. High resistance in connections, faulty coolant sensor are the equivalent of telling the pcm the engine is freezing, resulting in excessively rich fuel mixtures.

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Old 07-07-2016, 03:47 PM   #7
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1997 SC2
Default Re: 97 SC2 with code p0300 and p0340

i have a fuel pressure tester. what is the correct reading or range for that. only cylinder 1 seemed to be burning good (on plug) and seems to be very black (too rich of mixture) in cylinders 2-4. how can i check the egr to see if it is bad?

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Old 07-07-2016, 05:14 PM   #8
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2003 L-Series 3.0L Sedan
Default Re: 97 SC2 with code p0300 and p0340

Because '97's have the fuel check valve issue, engine running should show 40-55 psi. Three plugs black is a clue. The egr valve shouldn't be a factor here. When egr valves cause problems they create conditions where more exhaust enters the intake resulting in rough running, hesitation, balking and engine stalling. The only way to isolate egr valve issues is to make a temporary blocking gasket from soup can sheet metal: this blocks off both ports from interfering engine running.

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Old 07-10-2016, 10:43 PM   #9
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1997 SC2
Default Re: 97 SC2 with code p0300 and p0340

Thanks for all the help. ended up getting a noid light tester for the injectors and cylinder #1 wasn't getting a pulse. i switched two black wires when i redid wiring and it runs like a champion now thanks again!!!

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