Loss of power in first gear only?? - Mazda MX-6 Forum
 
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post #1 of 13 (permalink) Old 3-1-06, 23:07 Thread Starter
 
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Loss of power in first gear only??

Hey all,

As the title says.

I'm pretty good on the maintenance, so I don't think its that. Here's the list I found after doing a search. I've updated it with my car specs:

air filter - recently cleaned my 3" K&N cone intake filter
fuel filter - replaced this past summer
fuel injectors (clean or flush) - not cleaned since bought the car 4 years ago
PCV valve - not replaced since bought the car
check and replace if necessary O2 sensors - replaced this past Nov.
spark plugs - replaced 3 months ago
spark plug wires - replaced 3 weeks ago withn 8.5 mm MSD wires
distributer cap and rotor - replaced 2 years ago with along with the entire faulty distributor
throttle body cleaner (de-carb) - never done
calibrate throttle position sensor (TPS) - never done (how do you do this?)
adjust timing - done last November
check VRIS solenoids are working properly - never done (I might try the paper test next week)
Oil change - done 2 months ago
All fluids checked and topped up 5 months ago

BTW, car has only 150,000 km on it.

Any thoughts?

Thanks in advance everyone.

Ryan
MX6 LS - RIP March 2008; Now driving an '04 G35
Check out my garage sale
Here is some picts of my ride before the accident
Here are some picts after the accident

Last edited by Baconman6; 3-2-06 at 8:00.
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post #2 of 13 (permalink) Old 3-2-06, 3:39
 
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the whole time or just through part of the power band?
does how much throttle you give it matter?

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post #3 of 13 (permalink) Old 3-2-06, 7:59 Thread Starter
 
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the whole time and it's only when I tromp it. It drives completely fine otherwise

Ryan
MX6 LS - RIP March 2008; Now driving an '04 G35
Check out my garage sale
Here is some picts of my ride before the accident
Here are some picts after the accident
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post #4 of 13 (permalink) Old 3-2-06, 8:26
 
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have you done any removal of the timing belt? put on new pully ect..? I would set your car on base timing... this is completed by opening up ur hood there is a little plastic box beside your fuse box.. this is a ("pin connect" location) used to scan the car.. get a nice size paperclip and put between pin 10 and ground on this connector.. this will not let you have good power but check to see if that "lag" is still consistant in 1st gear... remember this is BASE Timing so be gentle! if so this might not be a timing problem.. scrape ur rotor in dist.

Have you checked your VRIS connectors at the back of ur manifold? make sure all the vacume lines are connected, and even check to see if they are opening or not- (car running)
have you installed any aftermarket fuel mod? does the exhaust smell ritch? You say the cars timing was adjusted a year ago... the cars timing runs off the crank position sensor so im not sure how u "timed" it ?? how is this crank sensor? how does the car idle? no backfires?
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post #5 of 13 (permalink) Old 3-2-06, 10:37
 
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atx or mtx?

Quote:
Originally Posted by Darmstro
Get your car to the mechanic as soon as possible...YOU'RE STEERING WHEEL IS ON THE WRONG SIDE!!!!!!!!!!!
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post #6 of 13 (permalink) Old 3-2-06, 11:28
 
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Quote:
Originally Posted by prob3r
atx or mtx?
i was gonna say ur clutch may be going but if its atx then it could be timing/or running too rich
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post #7 of 13 (permalink) Old 3-2-06, 12:04
 
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could be multipul things if its a atx thats why i asked which he had

Quote:
Originally Posted by Darmstro
Get your car to the mechanic as soon as possible...YOU'RE STEERING WHEEL IS ON THE WRONG SIDE!!!!!!!!!!!
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post #8 of 13 (permalink) Old 3-2-06, 16:26 Thread Starter
 
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Mtx.

Haven't checked the VRIS connectors. I will later this week.
No aftermarket fuel mod. I timed it with a timing light and shifted the distributor (with the gnd 10 pin diagnostics connected with a paper clip) until it read 10 degree below TDC. Car idles great (600-800 rpms) - no backfires.

My clutch in a Clutchmasters stage 1 and its only been on for 30,000 km. I never drop the clutch and I don't really ride it, so I don't think it's already slipping (god I hope not...)

And yes, I think I'm running rich. The exhaust smells bad (but it isn't oil, cause I smelt that exhaust prior to changing my VCGs) and I just barely passed my recent emissions because of borderline high hydrocarbons (even after changing both my 02 sensors and catalytic converter a week before the test).

How would I determine if I'm truly running rich? I have an autometer air fuel gauge, but it still seems to give the same readings as it always had (ie. just shooting back and forth between the red lean indicator through the yellow stoich to green rich indicator).

If this is the case, what should I be changing/fixing?

Sorry for the exorbitant description guys...

Ryan
MX6 LS - RIP March 2008; Now driving an '04 G35
Check out my garage sale
Here is some picts of my ride before the accident
Here are some picts after the accident

Last edited by Baconman6; 3-2-06 at 16:32.
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post #9 of 13 (permalink) Old 3-2-06, 17:53
 
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a/f is not accurate on a narrow band o2 ... its just a light show... you would actually need to get a wideband to get a true 02 reading

Quote:
Originally Posted by Darmstro
Get your car to the mechanic as soon as possible...YOU'RE STEERING WHEEL IS ON THE WRONG SIDE!!!!!!!!!!!
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post #10 of 13 (permalink) Old 3-2-06, 18:31
 
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or pull the plugs and take a look
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post #11 of 13 (permalink) Old 9-15-06, 22:09 Thread Starter
 
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Plugs look fine & the VRIS's are fine (I tested both at idle by swapping the connectors).

Any other thoughts?

Ryan
MX6 LS - RIP March 2008; Now driving an '04 G35
Check out my garage sale
Here is some picts of my ride before the accident
Here are some picts after the accident
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post #12 of 13 (permalink) Old 9-16-06, 23:56
 
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my thought is ... if it is only screwing around in first gear but pulls strong in all the others its a grearbox/clutch issue rather than an engine problem.

as far as i know the ecu doesn't care what gear you're in much less even know, so if it pulls in one gear it should do all....

thats my best guess...
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post #13 of 13 (permalink) Old 9-17-06, 10:50 Thread Starter
 
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that's unfortunately what I was thinking too...

Ryan
MX6 LS - RIP March 2008; Now driving an '04 G35
Check out my garage sale
Here is some picts of my ride before the accident
Here are some picts after the accident
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