DOHC blog at WOT?

[havik]

ok..this is on w-bdoy too but i figured this site would know a little more..as it more towards engine and not car.

i have a problem. my lumina z34 sucks off the line. from a dead stop..at WOT, it almost chokes and it just wont budge up until 4k on the tranny. then it pulls liek normal.

first thing every said was basic stuff. do plugs..wires..filters. i've done all of it. coil packs, wires, plugs, fuel filter, run-rite, air filter. nothing seemed to work. car runs great though

next thing..it turns mechanical. they said fuel pump or throttle position sensor. well my car only has 77xxx on it..so the fuel pump is fairly good and theoretically, shouldnt be close to going yet. no buzzing or humming yet, and wouldnt it cause an all around performance decrease? i changed the throttle sensor from my euro which i know was good cuz the euro3.4 did sick burn outs. it didtnt help. we did an idle relearn and that didnt help it afterwards either.

i'm changing the fuel pump in the next few days. if its not that..any1 else have any ideas. we're tossing around injectors, which is a small chance cuz of the run-rite..or a tranny vacuum line being crimped or punctored, but again, that would be all around decrease in performance. just wondering what you guys think. i just had the timing belt, serp belt, water pump, altenator done. so none of that.

[SappySE107]

RE: DOHC blog at WOT?

Who did the timing belt? I put the cam timing as my choice for your issue. How old is the O2? Have you ran the car on a scanner to see if all the sensors are good? IAT sensor could cause problems, as can a bad coolant sensor (and there are 2 so the gauge in the car could be sayin 1 thing, and the computer seeing another).

[havik]

Re: RE: DOHC blog at WOT?

Who did the timing belt? I put the cam timing as my choice for your issue. How old is the O2? Have you ran the car on a scanner to see if all the sensors are good? IAT sensor could cause problems, as can a bad coolant sensor (and there are 2 so the gauge in the car could be sayin 1 thing, and the computer seeing another).

i had my local mechanic do the belt when i got the altenator done. i havent hoooked it up on a scanner..as i dont have one and dont feel like paying any more mechanics for a while. will the paperclip trick work?

[SappySE107]

RE: Re: RE: DOHC blog at WOT?

nope, papertrick won't do shit for you right now. What year is your car? Where are you located? Myself or maybe someone else could scan it possibly.

I have 0 faith in mechanics when it comes to timing these motors. Its possible your mechanic knew what to do, but its more likely that your timing isn't where it should be, correct tension wasn't set, etc. I could be wrong, but im still saying cam timing.

[havik]

Re: RE: Re: RE: DOHC blog at WOT?

nope, papertrick won't do shit for you right now. What year is your car? Where are you located? Myself or maybe someone else could scan it possibly.

I have 0 faith in mechanics when it comes to timing these motors. Its possible your mechanic knew what to do, but its more likely that your timing isn't where it should be, correct tension wasn't set, etc. I could be wrong, but im still saying cam timing.

i'm in jersey. toms river area.

psychox had said it could have been the mechanics..but honestly, i dont htink so. it was going it prior to the timing belt being changed. its done it since i've had the car. its a 93 z34.

[SappySE107]

RE: Re: RE: Re: RE: DOHC blog at WOT?

I still say timing unless he retimed it and has the tools.

[havik]

Re: RE: Re: RE: Re: RE: DOHC blog at WOT?

i just ran it at the track at it was pathetic. i almost got beat by a bone stock 2.2 sunfire. i ran a 17.9 at 89 mph? i know..that time and speed dont match up. somwhere between me starting to pull and finishing..i pulled like a bat outta hell...but somewhere between the line and 4rpm..i didnt move. my 60' time was 2.9

still say its timing? wouldnt timing make the engine run like crap all around..not only off the line?

[SappySE107]

RE: Re: RE: Re: RE: Re: RE: DOHC blog at WOT?

Nope, timing the motor can make it do that. I ran a similar time and speedb when I bogged off the line and got a 4 second 60 foot though with my 5 speed.

I guess you need to get it on a scanner and see what the computer is doing, cause thats a very odd time you got at the track for an auto.

[havik]

Re: RE: Re: RE: Re: RE: Re: RE: DOHC blog at WOT?

Nope, timing the motor can make it do that. I ran a similar time and speedb when I bogged off the line and got a 4 second 60 foot though with my 5 speed.

I guess you need to get it on a scanner and see what the computer is doing, cause thats a very odd time you got at the track for an auto.

agreed. the scanner came up as exhaust. AAMCO did it..i dont know the exact code. apparently..my engine mounts are shot..so the engine movement at WOT is stronger..which causes me to crimp a gasket going from the header to the exahust pipe.

or thast what i'm told. it woudl explain the shakes when stopped..but i'm going to hvae it retimed anyhow.

here..you might know this..is the 6/6 timing and the 13* retard timing the same? and what is each one? i'm thinking if i'm having i retimed..i shoudl pay the little extra and time it for performance. what whoudl recommend..providing they are differnt.

[SappySE107]

RE: Re: RE: Re: RE: Re: RE: Re: RE: DOHC blog at WOT?

THey are very different. 13 degree exhaust retard is for top end, starting at 4k. 6 advanced intake and 6 retarded exhaust gives a smoother idle, more low end, noticably around 2k compared to 13 degrees, but a noticable hit on top end after 6200. With an auto, I would use 6/6.

[havik]

hey..if i do have bad timing..could i retime it correctly without taking off teh belt if i bought the timing tool fron the store?

i was planning on having it re-timed anyway..just to make sure.

hell..does the tool make 6/6 possible?

[RednBlack]

Tool is probably the best way. Ben did mine with the 6-6, and it rocks. I agree with him. Even though a "mechanic" did your timing, these engines are very hard to time. I drove mine for over a year, thinking it ran great, until Ben got ahold of it and found out the timing was off and the O2 sensor was bad.

But, I am having problems with your speed vs time. You must have some serious top end, and I want it. I run 15s at slower speed than that.

There are some members close to you that could help I believe.

[havik]

Tool is probably the best way. Ben did mine with the 6-6, and it rocks. I agree with him. Even though a "mechanic" did your timing, these engines are very hard to time. I drove mine for over a year, thinking it ran great, until Ben got ahold of it and found out the timing was off and the O2 sensor was bad.

But, I am having problems with your speed vs time. You must have some serious top end, and I want it. I run 15s at slower speed than that.

There are some members close to you that could help I believe.

please. if there is any1 around the jersey shore who can help me..it'd be great. i dont trust myself to time the damed thing and i really dont want to take it back to the mechanic. worst comes to worst..i drive out and see ben. lol. he'll have no problem helping me out, right?

and i just realized i dont have a signature picture yet so if you guys wants pics.. www.cardomain.com/id/havikx

[SappySE107]

I charge 300 to redo the timing on the 91-93. 200 for 94-95. You may find someone local that will help you out for a case of beer. I used to do that but this is the only job I have really. I don't find it all that hard, just time consuming. The tool does make life a lot easier. The tool is timed in cam degrees, not crank. It has a notch for 2 4 6 8 10 12, which is really 4 8 12 16 20 24 crank degrees. For 6/6, you time it between the 2 and 4.

[havik]

I charge 300 to redo the timing on the 91-93. 200 for 94-95. You may find someone local that will help you out for a case of beer. I used to do that but this is the only job I have really. I don't find it all that hard, just time consuming. The tool does make life a lot easier. The tool is timed in cam degrees, not crank. It has a notch for 2 4 6 8 10 12, which is really 4 8 12 16 20 24 crank degrees. For 6/6, you time it between the 2 and 4.

i dont care about money. i just want the damned thing done right and who better? is there any1 on this board around the jersey shore area?