Question about 1985 Nissan Pickup

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85 nissan pickup high co levels on emissions test. Been running high octane gas and added fuel treatment . Now have higher co levels . Any ideas appreciated

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Posted on Jan 02, 2017


SOURCE: 1994 Nissan Pickup 4x4 2.4L, Lack of Power

hi check and make sure that your clutch fan is not seased up and any of your pullies as well,and check for good exhaust flow unhook cat convertor then take for drive and see if it has power

Posted on Feb 06, 2009

  • 140 Answers

SOURCE: 1988 nissan pickup engine rotates but does'nt start.

it sounds like the injectors are not opening up man.. replace the injectores and this should fix your problem..good luck keith....

Posted on Mar 21, 2009

  • 383 Answers

SOURCE: HC & CO% emission

prabhatk8: I am going to run several things by you, OK?
1. If the oil and filter have not recently been changed, it is possible that the high readings are a result of what has collected in the crank case and is being drawn up through the PCV. The contamination is enough to fail the emissions. You did not mention the numbers, so I can only offer suggestions, starting with the simplest solutions and continuing on with more complex solutions.
2. The Ignition timing being advanced can cause the condition you have described, to a certain degree. However, the HC readings, are these being taken at an idle and at above 2,200 RPM ?
3. Nissan also dated their plug wires. If you look at the wires closely, the outer insulation should have the year the wires were manufactured. The insulation is marked about every 6 inches or so. Old wires can cause agrivate a problem like you have.
If the car has the factory wires, they will either have the name "Yazaki" or "Sumitomo" on the wire insulation. These are excellent quality wires! If you decide to replace them, either replace them with the factory (dealer supplied) wires or ones made by NGK.
I have found nothing equal to them in performance and longevity.
Don't go cheap on the ignition parts! Too much of an air gap between the cap and rotor will raise the HC level. Excessive gap on spark plugs or weak spark will also create the condition.
The oxygen sensor can cause the problem, however, don't just replace it because you suspect it may be bad. The part can be tested, but you may not be equipped to do so. Check with Auto Zone or O'Reilley's. They have scanners. Some of these scanners have the ability to monitor the Oxygen sensors in "Real time". Which means looking at them functioning while you are standing there. The sensor is actually a voltage generator which generates milli volts based off of the exhaust passing over it. The more or less oxygen that is present in the exhaust, changes the voltage values which in turn is sent to the ECM to adjust the pulse width of the injectors , keeping the CO and HC within certain parameters.
Technically they refer to it as a "Lamda Window".
(Lamda, Lambda, Lambda and Omega Moo!)( I couldn't resist! For those of you who saw the movie the Revenge of the Nerds)
Sorry...where was I.?.........
4, A false air problem can cause this symptom depending on where the leak is. Check for a small crack or leak in the boot which connects the air mass sensor with the throttle body.
5. The Altima's among other Nissan's had problems with condensation dripping down on top of the ECM's connectors where they plug into the ECM. When they got corroded, this would affect the performance , including EMISSIONS.
PK, I hope this will give you some direction to go in. If the numbers are "real close" In all likely hood, if you change the oil and filter just before you go for the test, you will probably pass.
Tell me what the numbers are, including th e "NOX" figures.
I I know what these are, I can help you more easily. What I am doing here is shooting in the dark!
Good luck and let me know if I have done you any good.
P.S. If you un-plug the connectors at the ECM and they are corroded, there are cleaners you can buy from Radio Shack and the local automotive parts houses. One is for cleaning and neutralizing the corrosion and the other is a dialectic grease which you apply to the connectors afterword's to keep corrosion from coming back.

Posted on Apr 18, 2009

  • 1596 Answers

SOURCE: clutch slips in high gear when I give gas going up

Im Taking this is a Manual Trans you have , If So Yes You CAN Adjust but Im Afraid to Say Its on Its Way Out << The CLUTCH, and you will need A "CLUTCH JOB, Requiring Transmission Removal.
1. Clutch DISC
5. ANY ENG. / TRANS. Oil SEALS Needed

Hope this Helps Although its BAD NEWS You can Save Money Repairing it SOON so as NOT to Cause Any More Damage

Posted on Jun 16, 2009

  • 3085 Answers

SOURCE: Im curious about octane in fuel and what it does.

Octane is an added ingredient that burns more efficently than gasoline..use the 91 octane rating that your owner's manual specifies. Lower octane will degrade performance, higher than 91 is wasting money because it has more octane and is more expensive, but does not improve performance.

Posted on Jan 09, 2010

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It used to be that using a low octane fuel in an engine designed to use high octane fuels could damage the engine.
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My nissan altima 1999 did not pass the smog test due to "high emission", it also does not have the check engine light on or give any obd codes. What could be the problem?

Robert, High emissions usually mean the EGR valve and several hoses and other smog components are clogged up. There is no easy fix, you have to get the shop to check through the smog system on your car if you cannot do it yourself. Type of driving, short runs, high miles, burning oil etc all contribute to the engine giving a dirty reading. It may not be enough to light the lamp but it'll be dirty enough. Of cause, it may be the lamp is bust as well? Does it test light when you start up?

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The only reason to run higher octane fuels to to reduce the chance of (engine ping) or (engine knock).Try the regular gas(dont completely fill car) and take notice under hard acceleration if engine makes a pinging noise.If pinging happens then add some high octane gas to compensate for regular.Unless this is a modified engine the regular gas will not do any damage it will result in pinging and loss of fuel milelage.

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Unless your owner's manual or the dash board by the gas gauge says High test only, I'm sure reg 87 octane will be fine. Most cars are made to run on 85 octane or lower, so when you but the cheap stuff, 87, it is like high test to the engine. But, if it knocks, pings, stammers at all, then it needs higher octane. So, i would run a tank of low test, then high test , and see if there is a noticeable difference, especially in take off. If you suspect a dirty injector or throttle body, don't be afraid to dump in a can of gas treatment, it works great, STP or some other brand. It will clean a lot of stuff in there. Hope this helps.

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My truck has a really bad knock when I step on the accelerator... but it sounds fine when I let off? Any Ideas?

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Apr 17, 2010 | 1987 Nissan Pickup

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I have a 05 nissan sentra and it rides great, but the gas mileage is terrible only getting approximately 18-20 mpg. What may be the problem. I upgraded the gas octane.

you need to change the spark plugs and wires to properly burn the gas fully then you can just get agood oil change and you would get better gas mileage

Oct 29, 2009 | 2005 Nissan Sentra

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Premium or regular gas

Fuel comes in different grades due to octane levels, the higher grade the higher octane, the higher price. If you have the owners manual or window sticker, you would see that the car was probably made to run on 87 octane (regular unleaded), I have been through the different octane levels for more than 30 years and I have decided that the cheapest runs as well as the most expensive. The higher octane will sometimes cause an engine to ping or rattle under acceleration, if this happens to yours go back to the cheap stuff and everything will be fine. That is my opinion, others may differ, but I run my BMW on the cheapest I can find and I still get 31 MPG hwy.

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