please help.....have a constant miss over 5K, please read, i cant figure it out....
Registered User
Joined: Jul 2002
Posts: 131
From: Northern VA
tom,j,brian(s),
thanks for the info.
sleeper, I'm guessing that with your 160 and prog. you're rarely running hot (above 200)? and you're still stumbling like the rest of us?
I'm going to try the bolt spacer for the coil...and checking/changing plugs and wires...see where that leaves me.
j, i know what you're talking about with our hot a** days..alexandria, va here!!! How often does your baby miss now? daily? under what cicumstances?
sleeper, let us know how it goes with the new opti & plugs/wires.
Cheers,
-MJ
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MJ - 1995 z28 M6
Eibach Lowering Springs, KYB Shocks, K & N Filter Kit, Borla Exhaust, Ground Effects.
[This message has been edited by MJ_Z28 (edited August 22, 2002).]
thanks for the info.
sleeper, I'm guessing that with your 160 and prog. you're rarely running hot (above 200)? and you're still stumbling like the rest of us?
I'm going to try the bolt spacer for the coil...and checking/changing plugs and wires...see where that leaves me.
j, i know what you're talking about with our hot a** days..alexandria, va here!!! How often does your baby miss now? daily? under what cicumstances?
sleeper, let us know how it goes with the new opti & plugs/wires.
Cheers,
-MJ
------------------
MJ - 1995 z28 M6
Eibach Lowering Springs, KYB Shocks, K & N Filter Kit, Borla Exhaust, Ground Effects.
[This message has been edited by MJ_Z28 (edited August 22, 2002).]
Registered User
Joined: Aug 2001
Posts: 356
From: SOUTH BEND IN USA
Guys start with the basics and go from there. Here's a list of things you guys should try and then see what happens.
Check for vacuum leaks.
Spray spark plug wires with water spray bottle to see if car starts to miss.
Check wires at night especially underneath the alternator area to see if wires are arching or anywhere else. (COIL WILL LIGHT UP - THAT'S OK)
Check fuel pressure @ WOT
Check spark plugs.
Check computer out and other sensors.
Have rockers been adjusted?
Before adjusting rockers again take pushrods out and check for straightness. If bent get new ones and re-adjust rockers.
Check compression for peace of mind and do a leak down test.
If your running emission crap inspect EGR valve and converter.
I really do believe most of your guys problems is electrical as in wires.
I had a brand new set of over the valve cover Taylors that i made and at night it was like a light show. I took them back and got a set of Accel Extreme 9000 wires and i custom fit those and also are arching right underneath my alternator area. I will wrap them and see what that does. I am also installing an AFR REV KIT to maintain valve float. If you guys have bigger cams do you have enough spring pressure but not too much and set up properly.
List can go on and on but these are most of the basic and important ones.
If anyone wants to add to this feel free.
Good Luck
Tony
Check for vacuum leaks.
Spray spark plug wires with water spray bottle to see if car starts to miss.
Check wires at night especially underneath the alternator area to see if wires are arching or anywhere else. (COIL WILL LIGHT UP - THAT'S OK)
Check fuel pressure @ WOT
Check spark plugs.
Check computer out and other sensors.
Have rockers been adjusted?
Before adjusting rockers again take pushrods out and check for straightness. If bent get new ones and re-adjust rockers.
Check compression for peace of mind and do a leak down test.
If your running emission crap inspect EGR valve and converter.
I really do believe most of your guys problems is electrical as in wires.
I had a brand new set of over the valve cover Taylors that i made and at night it was like a light show. I took them back and got a set of Accel Extreme 9000 wires and i custom fit those and also are arching right underneath my alternator area. I will wrap them and see what that does. I am also installing an AFR REV KIT to maintain valve float. If you guys have bigger cams do you have enough spring pressure but not too much and set up properly.
List can go on and on but these are most of the basic and important ones.
If anyone wants to add to this feel free.
Good Luck
Tony
Registered User
Joined: Dec 2000
Posts: 1,214
From: City of Champions, MA, USA
Maybe you should all just buy LS1's 
I don't have a miss yet, but you guys need to work out a solution so if does happen to me I don't have to start a thread 10 pages long. ahem (brian) see ya
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I WOULD RATHER PUSH A CAMARO THAN DRIVE AN IMPORT
1983 Z28- 406ci
LT1 intake
AFR 195's
1995 Z28- 350ci
A4, leather, T-tops bone stock for now.
250 RWHP 300 RWT
14.0 @ 99 MPH on a 2.2 60'
I don't have a miss yet, but you guys need to work out a solution so if does happen to me I don't have to start a thread 10 pages long. ahem (brian) see ya
------------------
I WOULD RATHER PUSH A CAMARO THAN DRIVE AN IMPORT
1983 Z28- 406ci
LT1 intake
AFR 195's
1995 Z28- 350ci
A4, leather, T-tops bone stock for now.
250 RWHP 300 RWT
14.0 @ 99 MPH on a 2.2 60'
Registered User
Joined: Feb 2002
Posts: 33
From: federalsburg, Md USA
MJ, since i did all the stuff, the car runs fine, as in no back firing, but it is sometimes sluggish if it is hot out side, i now only notice really a hesitation...
and i forgoyt last night that i had to put a plate back in my exhaust.. i m runnin a gutted cat, a borla cat back.. and well when it was hot even after i did all the stuff some times it would throw out a single pop or so.. but i put the 2 and a half(i think tapered plate back in.. with the taper facin the front of the car so i can get a little back pressure back in the system..... hope that may help some
any questions give me a "I.M."
screen name
slim mbc
-jason-
a.k.a slim
oh yeah how much did the person space the coil and heat sink away from the head? basically how big a spacer will i need...
------------------
Silver, 95Z, A4, 3.23's, homemade CAI, TB bypass, MAF screen, boot converted to a 1LE style, borla catback, gutted cat, upgraded coil, HPP III, 160 thermo, 8.8 mm wires, numerous tires, and 9 spark plugs (guess dealership thought i didnt need that 8th one till later
Fast enough to beat an '01 gt
and i forgoyt last night that i had to put a plate back in my exhaust.. i m runnin a gutted cat, a borla cat back.. and well when it was hot even after i did all the stuff some times it would throw out a single pop or so.. but i put the 2 and a half(i think tapered plate back in.. with the taper facin the front of the car so i can get a little back pressure back in the system..... hope that may help some
any questions give me a "I.M."
screen name
slim mbc
-jason-
a.k.a slim
oh yeah how much did the person space the coil and heat sink away from the head? basically how big a spacer will i need...
------------------
Silver, 95Z, A4, 3.23's, homemade CAI, TB bypass, MAF screen, boot converted to a 1LE style, borla catback, gutted cat, upgraded coil, HPP III, 160 thermo, 8.8 mm wires, numerous tires, and 9 spark plugs (guess dealership thought i didnt need that 8th one till later
Fast enough to beat an '01 gt
Registered User
Joined: Jul 2002
Posts: 131
From: Northern VA
guys,
just had a thought after reading j's post. Are we all running straight back exhaust system? I'm running the borla cat-back...and I beleive I have the factory cat there...suggestions on how to check that???
I know the borla has no plates in it...so it can't be making all that much backpresure on the system. Thoughts.
Cheers.
-MJ
------------------
MJ - 1995 z28 M6
Eibach Lowering Springs, KYB Shocks, K & N Filter Kit, Borla Exhaust, Ground Effects.
just had a thought after reading j's post. Are we all running straight back exhaust system? I'm running the borla cat-back...and I beleive I have the factory cat there...suggestions on how to check that???
I know the borla has no plates in it...so it can't be making all that much backpresure on the system. Thoughts.
Cheers.
-MJ
------------------
MJ - 1995 z28 M6
Eibach Lowering Springs, KYB Shocks, K & N Filter Kit, Borla Exhaust, Ground Effects.
Thread Starter
Registered User
Joined: Sep 2001
Posts: 903
From: boxboro, MA, USA
im gonna have to say the exhaust/backpressure issue is 100% not related to this. at the speeds we are talking here id bet that backpressure wouldnt be an issuie, plus from what i read you can never have too little backpressure on our cars (v8's in general). only thing i could see being related to this in the exhaust is some kind of vibration causing it to hit something causing false knock......
brian
brian
Registered User
Joined: Jun 2002
Posts: 537
From: McAllen Tx. USA
Same Problem here.
Description: Car runs perfectly, and pulls very hard until it gets warm (about 15 minutes of driving). After that it begins to bog and any rpm under load, in all gears. The higher the gear, the less bogging, but the lower ration gears (5-6) the bogging effect is dramatic.
It is certainly *HEAT* related, but I have been unsucessful in narrrowing down the problem. First I thought about the ICM, and coil bracket was getting too hot, I put spacers between the block and bracket (3 inches) and it did not help. Tried a new coil, and the problem still persisted.
I then begin to think about the problem. My car pops quite a bit with dual exhaust, but even when it was stock (4 mths ago) I always noticed some popping with the stock catback. Then I come to find out that my car shoots flames out of the exhaust upon shifting during WOT. I have video of it. So Ok, I am running rich. Then I think about how the bogging effect is less dramatic when I am in a stonger gear (1-3, heavy load) and how there is no bogging when I am at WOT, but only partial trottle. Then I think just how close the drivers side exhaust pipes runs about 1 inch apart from my fuel lines. So I come to the conclusion, that I might be experiencing partial "vapor lock" and that my problem is fuel related and not ignition related. It could just be that there is no bogging under WOT because the fuel pressure is much higher and it is pushing any partial vapor lock I might be experiencing. Possible right, then I start to think that maybe my fuel pump just is not performing very well after it heats up. I will be ordering a fuel - set up with race-tronix shortly, re-route my exhaust pipes, and replace the fuel filter.
I will report to you soon. Just thought I share.
------------------
1996 Z-28 6-Speed
ASM CAI,Ported MAF,GM 1LE Elbow,CC Airfoil, Hooker LT,Custom Dual 2.5in Exh,4.10 Gears,MSD 6AL,MSD Blaster Coil, Taylor 8mm Wires,Bosch Plats.,LT4KM,!EGR,!AIR,!CAGS, Pro-Form Shift Light.
Not Installed Yet:
XE 230/236, CC 1.6 Rollers, CC Guideplates, CC 7/16 Studs, GMPP Dual Valve Springs, CC Chromemoly Pushrods.
Accumulating parts.....He HE
Description: Car runs perfectly, and pulls very hard until it gets warm (about 15 minutes of driving). After that it begins to bog and any rpm under load, in all gears. The higher the gear, the less bogging, but the lower ration gears (5-6) the bogging effect is dramatic.
It is certainly *HEAT* related, but I have been unsucessful in narrrowing down the problem. First I thought about the ICM, and coil bracket was getting too hot, I put spacers between the block and bracket (3 inches) and it did not help. Tried a new coil, and the problem still persisted.
I then begin to think about the problem. My car pops quite a bit with dual exhaust, but even when it was stock (4 mths ago) I always noticed some popping with the stock catback. Then I come to find out that my car shoots flames out of the exhaust upon shifting during WOT. I have video of it. So Ok, I am running rich. Then I think about how the bogging effect is less dramatic when I am in a stonger gear (1-3, heavy load) and how there is no bogging when I am at WOT, but only partial trottle. Then I think just how close the drivers side exhaust pipes runs about 1 inch apart from my fuel lines. So I come to the conclusion, that I might be experiencing partial "vapor lock" and that my problem is fuel related and not ignition related. It could just be that there is no bogging under WOT because the fuel pressure is much higher and it is pushing any partial vapor lock I might be experiencing. Possible right, then I start to think that maybe my fuel pump just is not performing very well after it heats up. I will be ordering a fuel - set up with race-tronix shortly, re-route my exhaust pipes, and replace the fuel filter.
I will report to you soon. Just thought I share.
------------------
1996 Z-28 6-Speed
ASM CAI,Ported MAF,GM 1LE Elbow,CC Airfoil, Hooker LT,Custom Dual 2.5in Exh,4.10 Gears,MSD 6AL,MSD Blaster Coil, Taylor 8mm Wires,Bosch Plats.,LT4KM,!EGR,!AIR,!CAGS, Pro-Form Shift Light.
Not Installed Yet:
XE 230/236, CC 1.6 Rollers, CC Guideplates, CC 7/16 Studs, GMPP Dual Valve Springs, CC Chromemoly Pushrods.
Accumulating parts.....He HE
Registered User
Joined: Jul 1999
Posts: 3,647
From: Winnipeg, Manitoba, Canada
Do you hear any chattering above 2000rpm?
Have you ever had the valve covers off to adjust anything in the past?
What kind of oil are you running?
If you hear a chattering/ticking above 2000rpm during part throttle then its either loose rockers, loose exhaust manifold, or bad main bearings.
If it was a loose exhaust manifold it would pop on deceleration as well.
Run some soapy water along the edges of your intake manifold and see if it bubbles or gets sucked in.
------------------
'93 Camaro Z28 Automatic with a ZL1 hood.
No bottle.
No blower.
383 cubic inch serving of horsepower...hold the rice please.
Thats all you need to know.
ICQ: 23984221
Gripenfelter's Homepage
Disclaimer: The opinions expressed by me are not necessarily supported or indicative of the Government of Canada or any other Federal Employee.
Have you ever had the valve covers off to adjust anything in the past?
What kind of oil are you running?
If you hear a chattering/ticking above 2000rpm during part throttle then its either loose rockers, loose exhaust manifold, or bad main bearings.
If it was a loose exhaust manifold it would pop on deceleration as well.
Run some soapy water along the edges of your intake manifold and see if it bubbles or gets sucked in.
------------------
'93 Camaro Z28 Automatic with a ZL1 hood.
No bottle.
No blower.
383 cubic inch serving of horsepower...hold the rice please.
Thats all you need to know.
ICQ: 23984221
Gripenfelter's Homepage
Disclaimer: The opinions expressed by me are not necessarily supported or indicative of the Government of Canada or any other Federal Employee.
Thread Starter
Registered User
Joined: Sep 2001
Posts: 903
From: boxboro, MA, USA
well, heard from the mechanic, he says car is 100%. heres what i did:
1)went to stock AC delco plugs gapped appropriately
2)went to MSD OTVC wires
3)added made for you wire looms
4)installed torque arm and driveshaft loop (hehe, i had to put it in, i know it had nothing to do with it but hey, it was done same time
)
ill be picking it up today and ill get on it to see if the high miss is gone, as all this fixed my really bad low rpm bogging....
brian
1)went to stock AC delco plugs gapped appropriately
2)went to MSD OTVC wires
3)added made for you wire looms
4)installed torque arm and driveshaft loop (hehe, i had to put it in, i know it had nothing to do with it but hey, it was done same time
)ill be picking it up today and ill get on it to see if the high miss is gone, as all this fixed my really bad low rpm bogging....
brian
