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Old 10-16-2006, 01:59 PM   #1
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Default Issues with 2001 Grand Prix GTP

Well I just got done taking a 2000 mile road trip with the car. About half way through the trip the check engine light started blinking. The car started a slight miss. Well the car was getting ready to turn 100K so I had the codes read and it came up with P0203 and P0303 the auto shop said a tune up should fix it. So I installed new plugs and wires. The car ran fine for about 200 miles and then I shut it off and restarted it and it ran rough. I ran a can of sea foam through it and it runs better now but was wondering is there another way to fix the injector besides replacing it. I had the car low on gas and today I will be replacing the fuel filter before deciding if I'm gonna take the fuel rail apart. After sea foaming and the tune up I increased fuel mileage from 25 to 29mpg. Also I might be replacing spark plug #3 if it shows signs of excessive fuel. Any other thoughts on it? The car is running awesome and I was just wondering if fuel injectors are know to go bad on these cars?
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Old 10-16-2006, 04:13 PM   #2
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Injectors aren't known to go bad, but occaisionally they can.

Check to make sure your plug wires aren't touching the wires leading to the O2 sensor. That is frequently a cause of roughness.
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Old 10-16-2006, 04:21 PM   #3
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X2 on checking for wires touching the O2 sensor wires.

Let us know what you find.
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Old 10-16-2006, 05:49 PM   #4
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As a way of keeping your injectors, valves and other fuel system components clean, you may wish to fuel up at stations that meet the "Top Tier" requirements. This is the TSB on it.

Quote:
Fuel System - TOP TIER Gasoline Recommendations

Bulletin No.: 04-06-04-047E

Date: August 17, 2005

INFORMATION
Subject:
TOP TIER Detergent Gasoline (Deposits, Fuel Economy, No Start, Power, Performance, Stall Concerns)

Models:
2006 and Prior All General Motors Passenger Cars and Trucks (U.*. Only)
2006 and All Prior Saturn Vehicles (U.*. Only)
2003-2006 HUMMER H2 (U.*. Only)
2006 HUMMER H3 (U.*. Only)
2005-2006 Saab 9-7X (U.*. Only)

Supercede:

This bulletin is being revised to add the 2006 model year, include additional models and add additional marketers of TOP TIER Detergent Gasoline. Please discard Corporate Bulletin Number 04-06-04-047D (Section 06 - Engine/Propulsion System).

A new class of gasoline, called TOP TIER Detergent Gasoline, is appearing at retail stations of some fuel marketers. This gasoline meets detergency standards developed by four automotive companies. A description of the concept and benefits of TOP TIER is provided in the following question and answer section.

Gasoline Brands That Currently Meet TOP TIER Detergent Gasoline Standards

As of August 15, 2005, the following gasoline brands meet the TOP TIER Detergent Gasoline Standards:
^ Chevron

Chevron has markets in 29 states in the West, Southwest and South, as well as in Alaska and Hawaii. ALL grades of Chevron with Techron gasoline meet TOP TIER Detergent Gasoline Standards.
^ QuikTrip (not to be confused with Kwik Trip)

What is TOP TIER Detergent Gasoline?

TOP TIER Detergent Gasoline is a new class of gasoline with enhanced detergency. It meets new, voluntary deposit control standards developed by four automotive companies that exceed the detergent requirements imposed by the EPA.

Where Can TOP TIER Detergent Gasoline Be Purchased?

The TOP TIER program began on May 3, 2004. Some fuel marketers have already joined and have introduced TOP TIER Detergent Gasoline. This is a voluntary program and not all fuel marketers will offer this product. Once fuel marketers make public announcements, they will appear on a list of brands that meet the TOP TIER standards.

Who developed TOP TIER Detergent Gasoline standards?

TOP TIER Detergent Gasoline standards were developed by four automotive companies: BMW, General Motors, Honda and Toyota.

Why was TOP TIER Detergent Gasoline developed?

TOP TIER Detergent Gasoline was developed to increase the level of detergent additive in gasoline. The EPA requires that all gasoline sold in the U.*. contain a detergent additive. However, the requirement is minimal and in many cases, is not sufficient to keep engines clean. In order to meet TOP TIER Detergent Gasoline standards, a higher level of detergent is needed than what is required by the EPA. Also, TOP TIER was developed to give fuel marketers the opportunity to differentiate their product.

Why did the four automotive companies join together to develop TOP TIER?

All four corporations recognized the benefits to both the vehicle and the consumer. Also, joining together emphasized that low detergency is an issue of concern to several automotive companies.

What are the benefits of TOP TIER Detergent Gasoline?

TOP TIER Detergent Gasoline will help keep engines cleaner than gasoline containing the "Lowest Additive Concentration" set by the EPA. Clean engines help provide optimal fuel economy and performance and reduced emissions. Also, use of TOP TIER Detergent Gasoline will help reduce deposit related concerns.

Who should use TOP TIER Detergent Gasoline?

All vehicles will benefit from using TOP TIER Detergent Gasoline over gasoline containing the "Lowest Additive Concentration" set by the EPA. Those vehicles that have experienced deposit related concerns may especially benefit from use of TOP TIER Detergent Gasoline.
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Old 10-20-2006, 11:08 PM   #5
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If the wires check out fine, see if the misfire codes keeps coming back. If so go for the coils.
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Old 10-22-2006, 12:28 AM   #6
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it'* injector related I know for sure. I found gas in the #3 injector spot. I just dumped 3 bottles of STP fuel treatment into the tank and so far I have no problems.
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