Engine misfire

Tiny
JEFF SORDYL
  • MEMBER
Do you sell t-shirts or hats? I'd be happy to advertise for the company!
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Thursday, January 30th, 2020 AT 8:55 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Jeff,

I will send your request to the owner. He is a really nice person. If he has something, he'll take care of you.

Take care of yourself.

Joe
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Friday, January 31st, 2020 AT 6:50 PM
Tiny
KEN
  • ADMIN
HI Jeff,

We do not sell t shirts, but sometimes we do give them away please PM me with your size and shipping address and I will send one out to you. :)

Ken
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Saturday, February 1st, 2020 AT 10:47 AM
Tiny
JEFF SORDYL
  • MEMBER
Wow, that would be great! Wouldn't mind doing a little advertising for you. Your mechanics are really good! Thank you 2CarPros. Com. I still can't believe your service is free. I would have had to pay to use other sites. Thanks again.
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Saturday, February 1st, 2020 AT 11:08 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
I told you he was a great guy. Hope you enjoy it!

Joe
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Saturday, February 1st, 2020 AT 8:07 PM
Tiny
JEFF SORDYL
  • MEMBER
Now my car has a P0303. Back to one now.
I guessing a fuel injector? I also found the PCV valve was stuck. Bought a new one and running better.
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Sunday, February 2nd, 2020 AT 2:15 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
If plugs are good, there are no vacuum leaks, fuel pressure is within spec, then we have to consider an injector (like you mentioned), a compression issue within that cylinder, and timing issues. I have to be honest, if it was timing, I suspect it would involve more than one cylinder.

To start, here is a link that explains how to test an injector:

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Next, here is a link that explains how to test engine compression. Also, if you look through the first link below, it discusses symptoms of compression issues.

https://www.2carpros.com/articles/symptoms-of-low-compression

https://www.2carpros.com/articles/how-to-test-engine-compression

________________________________

Here are the specific directions for your vehicle. The attached pic correlate with the directions.

2005 Buick Allure (CANADA) V6-3.8L
Engine Compression Test
Vehicle Powertrain Management Tune-up and Engine Performance Checks Compression Check Testing and Inspection Component Tests and General Diagnostics Engine Compression Test
ENGINE COMPRESSION TEST
Engine Compression Test

Tools Required
J38722 Compression Tester

A compression pressure test of the engine cylinders determines the condition of the rings, the valves, and the head gasket.
1. Run the engine until it reaches normal operating temperature. The battery must be at or near full charge.
2. Turn the engine OFF.

3. Disable the ignition.

Important: Remove the Powertrain Control Module (PCM) and the ignition fuses from the I/P fuse block.

4. Disable the fuel systems.
5. Remove the spark plugs from all the cylinders.
6. Remove the air duct from the throttle body.
7. Block the throttle plate in the open position.

pic 1

8. Measure the engine compression, using the following procedure:
1. Firmly install J38722 to the spark plug hole.
2. Have an assistant crank the engine through at least four compression strokes in the testing cylinder.
3. Check and record the readings on J38722 at each stroke.
4. Disconnect J38722.
5. Repeat the compression test for each cylinder.

9. Record the compression readings from all of the cylinders.
The lowest reading should not be less than 70 percent of the highest reading.
No cylinder reading should be less than 689 kPa (100 psi).

10. The following are examples of the possible measurements:
When the compression measurement is normal, the compression builds up quickly and evenly to the specified compression on each cylinder.
When the compression is low on the first stroke and tends to build up on the following strokes, but does not reach the normal compression, or if the compression improves considerably with the addition of three squirts of oil, the piston rings may be the cause.
When the compression is low on the first stroke and does not build up in the following strokes, or the addition of oil does not affect the compression, the valves may be the cause.
When the compression is low on two adjacent cylinders, or coolant is present in the crankcase, the head gasket may be the cause.

11. Remove the block from the throttle plate.
12. Install the air duct to the throttle body.
13. Install the spark plugs.
14. Install the Powertrain Control Module (PCM) fuse.
15. Install the ignition fuse to the I/P fuse block.

____________________________

Let me know if this helps.

Joe
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Sunday, February 2nd, 2020 AT 7:07 PM
Tiny
JEFF SORDYL
  • MEMBER
Lots of good stuff here for my tool box. I'll start with the injector. Then compression test. I did a block test and the fluid stayed blue. What a relief! I'll keep you posted. Thanks again!
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Sunday, February 2nd, 2020 AT 7:59 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
You are very welcome. I will watch for your reply.

Take care,

Joe
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Sunday, February 2nd, 2020 AT 8:08 PM
Tiny
JEFF SORDYL
  • MEMBER
I have a 13.6 if vacuum at idle at 1. Will this help at all?
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Tuesday, February 4th, 2020 AT 10:59 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
That's a bit low. Does it seem steady? I would like to see at least 16. You have checked for vacuum leaks, correct?

Joe
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Tuesday, February 4th, 2020 AT 7:30 PM
Tiny
JEFF SORDYL
  • MEMBER
Yes no more vacuum leaks. Wish I could adjust the darn idle! If it was your car, would you get a new throttle body? I used to race moto cross and work on my bikes back in the 1970's and 1980's and even worked on car's a little. But this is out of control. Lol
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Tuesday, February 4th, 2020 AT 8:03 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Honestly, at this point I may try to find a used one that is known to be good and try it. It's not a cheap part. As far as adjusting idle speed, I miss the old days. LOL

Joe
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Tuesday, February 4th, 2020 AT 8:42 PM
Tiny
JEFF SORDYL
  • MEMBER
Cannot find one? Been looking for awhile. One other thing, my idle drops below 1,000 after car warms up but if I slowly increase rpm's to a steady 12000 then my vacuum goes up to 17.
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Tuesday, February 4th, 2020 AT 10:53 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Do you mean 12,000 or 1,200? I have to be honest, if it is 1,200 and you hold the throttle steady, that is normal.
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Wednesday, February 5th, 2020 AT 8:43 PM
Tiny
JEFF SORDYL
  • MEMBER
I meant 1,200 rpm's. But soon as I let off of gas is goes below 1000. (600 rpm's) well I found a used throttle body on eBay for $30.00. Get it next week. I'll let you know next week. Thank you again. I'm sure you have others with questions so I won't bother you.
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Wednesday, February 5th, 2020 AT 8:48 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Okay, let me know. However, 600 rpm's isn't too far off. I think this car is going to drive us both crazy. LOL No pun intended. LOL

I will watch for your reply and pray it takes care of the problem.

Joe
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Wednesday, February 5th, 2020 AT 8:55 PM
Tiny
JEFF SORDYL
  • MEMBER
New throttle body definitely made a difference. Idle is steady at 1,000 rpm's and vacuum is a consistent 14 to 16. But now I have a new code for EVAP leak. Forgot code number? Fix gas cap and problem fixed.
But I definitely have a vacuum leak somewhere on the car. Still have code p0300. When I find it I will let you know.
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Monday, February 10th, 2020 AT 5:39 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Glad to hear it's running better. I don't remember if I included this, but here is a link that will help locate a vacuum leak:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Let me know.

Joe
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Monday, February 10th, 2020 AT 7:24 PM
Tiny
JEFF SORDYL
  • MEMBER
Okay, thanks. My fuel pressure is 70psi. Would a fuel tank vapor sensor or pressure sensor cause this issue?
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Monday, February 10th, 2020 AT 8:16 PM

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