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Loss of power with engine pitch change... 

 

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 Post subject: Loss of power with engine pitch change...
Posted: Fri Apr 11, 2008 11:18 pm 
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This is a bit of a long shot, but hopefully someone may have experienced the same before.

My car drives fine and when I give it herbs, it will pull hard to about 4500 - 5000 but it then loses power and the exhaust note seems to get a bit harsher.

When I pulled off the Freeway tonight onto North Beach Rd, I gave it some s**t in first where it did what I've just described and banged it into 2nd. Looking in the rear view, I could see a fair bit of smoke in the lights of the cars behind me.

I'm assuming it could be a fuel problem, but am not sure. It's not blowing any smoke driving normally, and when I revved the s**t out of it in the garage there was no sign of anything.

Do the symptoms sound familiar to anyone?

 

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Posted: Fri Apr 11, 2008 11:42 pm 
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Sheesh could be anything from spark plugs / leads to leak on inlet ?? I'd try cleaning MAF or atleast check??? Could even be cracked / blocked cats ??
Check fuel reg vacuum line ??

 

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Posted: Fri Apr 11, 2008 11:48 pm 
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Dunno about fuel problem but more like spark problem causing incorrect burning of fuel or as EBXR8380 said incorrect mixtures due to vacuum leak etc.
Cats are still suspicious from previous issues i remember.....

 

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Posted: Fri Apr 11, 2008 11:51 pm 
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YEP could be simple as coolant in EGR nr throttle body leaking .. Being that it clears at higher rpm ???
Could be 1001 things....

 

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As in ZOOM 126 edition
331 Dart block,3.25/ 4340 steel crank, Oliver rods,TFS ported track heat heads, TFS track heat inlet Twin SC61 turbo's
Project 1UZ-EF has started.. S475 Turbo 4.0 V8 Mustang Celica.....

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Posted: Sat Apr 12, 2008 1:27 am 
Getting Side Ways
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Yeah, I figured as much...

I just cleaned the maf yesterday which was pretty grubby.

I went out to pick the gf up just now and noticed that if I ease the throttle on, it'll rev out no worries. If I flat-foot it, that's when it s**t itself...

Willl have to check plugs and leads tomorrow.

I still haven't looked at the cats Jeff. I was told they were all good, but never got to see them. When I can find somewhere to do it, I'll get them off and have a look.

 

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Trickflow Street Heat top end kit, 70mm BBK TB & EGR, 24lb injectors, Underdrives & 3.73s: 275rwhp - 13.15@105mph NA / 12.37@116mph N20

When injustice becomes law, resistance becomes duty

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Posted: Sat Apr 12, 2008 1:31 am 
Getting Side Ways
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Scaffy wrote:
I went out to pick the gf up just now and noticed that if I ease the throttle on, it'll rev out no worries. If I flat-foot it, that's when it s**t itself...


Exactly the same symptoms as when i had a dirty MAF. Cleaned in some white spirits and all was sweet. If it was real grubby as you say it may have damaged it.

 

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Posted: Sat Apr 12, 2008 2:01 am 
Getting Side Ways
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Well, in comparison to normal when I've cleaned it before. I just put it down to the air filter being cleaned and oiled not so long ago. Maybe when cleaning it I've damaged it, but was very gentle with cotton tip and contact cleaner. Or could be one of the many other things... crap

 

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Trickflow Street Heat top end kit, 70mm BBK TB & EGR, 24lb injectors, Underdrives & 3.73s: 275rwhp - 13.15@105mph NA / 12.37@116mph N20

When injustice becomes law, resistance becomes duty

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Posted: Sat Apr 12, 2008 2:03 am 
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What Maf are you running?

 

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'95 EF XR8 auto, Advance headers, 3" exhaust, Cobra manifold, BBK 75mm throttle body , 80MM Marauder MAF, Vortech V2 T Trim , 307 rwhp, 405 ft/lb 13.2 @ 105 MPH

Now N/A (permanent Lag) - AFR 165's, Comp XE270 cam, 1.6 RR - 269 rwhp 14.1 @ 102mph.

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Posted: Sat Apr 12, 2008 10:31 am 
Getting Side Ways
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75mm with stock electrics I think.

I'm going to pull the plugs today and check them out to see how they're faring.

Can anyone tell me what they should be gapped to?

Jeff, are you no longer using your MSD coil? If not, what are the chances of chucking it in after doing the plugs to see if it's the stock coil causing me problems. BPT still haven't contacted me to let me know my replacement coil is in that I've been waiting for since December, along with my lead.

 

_________________

Trickflow Street Heat top end kit, 70mm BBK TB & EGR, 24lb injectors, Underdrives & 3.73s: 275rwhp - 13.15@105mph NA / 12.37@116mph N20

When injustice becomes law, resistance becomes duty

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Posted: Sat Apr 12, 2008 12:13 pm 
Getting Side Ways
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Scaffy wrote:
Can anyone tell me what they should be gapped to?


I'd imagine they'd require to be gapped to about 1.1.

Scaffy wrote:
Jeff, are you no longer using your MSD coil? If not, what are the chances of chucking it in after doing the plugs to see if it's the stock coil causing me problems. BPT still haven't contacted me to let me know my replacement coil is in that I've been waiting for since December, along with my lead.


Unfortunately mate the coil is sold and waiting to be packaged up and sent over east to another forum member. So i dont really want to put it into use again. I do have another std coil here that came off my ute though if that'll help. I'd be giving BPT a ring to get that coil if you've paid for it, if not give Dave @ A1 a ring and get an MSD one or a Crane one to suit.

 

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1999 XHII Falcon XR8 Ute 5.0L, TKO600 5spd, KB 2.1L Blower, 6.5psi, 12.2@113mph!!

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Posted: Sat Apr 12, 2008 12:29 pm 
Getting Side Ways
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Ride: EL XR8, '08 Mondeo XR5t

Power: 205 rwkw

Location: Perth
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No worries mate. I'll give you a buzz regarding the coil a bit later if I need to. Am off now to check out the plugs. Once I see the state of them I may be back on to get more info. Will probably give Dave a buzz at some stage soon.

 

_________________

Trickflow Street Heat top end kit, 70mm BBK TB & EGR, 24lb injectors, Underdrives & 3.73s: 275rwhp - 13.15@105mph NA / 12.37@116mph N20

When injustice becomes law, resistance becomes duty

Top
 Profile  
 
 
Posted: Sat Apr 12, 2008 3:26 pm 
Getting Side Ways
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I'd get that coil sorted eh.

Maybe buy a bosch coil for a few bucks and see if it makes a difference.

I would be getting up BPT for a replacement, Not your fault that you were supplied a faulty coil, should be reimbursed maybe and go for a msd one perhaps.

 

_________________

Because of Beer, Thirst is a Beautiful Thing!

'95 EF XR8 auto, Advance headers, 3" exhaust, Cobra manifold, BBK 75mm throttle body , 80MM Marauder MAF, Vortech V2 T Trim , 307 rwhp, 405 ft/lb 13.2 @ 105 MPH

Now N/A (permanent Lag) - AFR 165's, Comp XE270 cam, 1.6 RR - 269 rwhp 14.1 @ 102mph.

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Posted: Sat Apr 12, 2008 3:40 pm 
Getting Side Ways
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Age: 39

Posts: 1886

Joined: 26th Nov 2006

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Ride: EL XR8, '08 Mondeo XR5t

Power: 205 rwkw

Location: Perth
WA, Australia

Well, well, well... I just pulled the plugs out.

Numbers 4 and 6 were gapped to 1.1mm while all the others ranged from 2 - 2.5mm! Another episode to the saga to add to the pissedness.

I cleaned them all up and gapped them to 1.1mm and what a difference it's made, especially at idle. My problem of power loss is gone and it feels to be running smoother all round. I've only driven it around the block a couple of times, so will get a better idea as to the difference it's made after a day or 2s driving. Hopefully it'll be all good for Monday night.

 

_________________

Trickflow Street Heat top end kit, 70mm BBK TB & EGR, 24lb injectors, Underdrives & 3.73s: 275rwhp - 13.15@105mph NA / 12.37@116mph N20

When injustice becomes law, resistance becomes duty

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 Profile  
 
 
Posted: Sat Apr 12, 2008 4:31 pm 
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AU V8 plugs come out with a gap of 1.2mm (close enough). I gapped them to 1.0mm and it made a substancial difference to idle quality. Replacing oxygen sensors is a good thing to do also if the plugs look a bit suspect.
Thge 220 when in a poor state of tune can be mistaken for running on 7 cylinders.
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Posted: Sat Apr 12, 2008 4:53 pm 
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Good stuff scaffy!

Having a run on monday then? I'll be up for it too, just gotta sort out the TPS and potentially more with the box changing early, will see!

 

_________________

Because of Beer, Thirst is a Beautiful Thing!

'95 EF XR8 auto, Advance headers, 3" exhaust, Cobra manifold, BBK 75mm throttle body , 80MM Marauder MAF, Vortech V2 T Trim , 307 rwhp, 405 ft/lb 13.2 @ 105 MPH

Now N/A (permanent Lag) - AFR 165's, Comp XE270 cam, 1.6 RR - 269 rwhp 14.1 @ 102mph.

Top
 Profile  
 
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