Author Topic: throttle response gone??  (Read 9629 times)

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Offline shmed

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throttle response gone??
« on: November 17 2013, 02:24:03 PM »
hi all   ok heres the problem
I changed valve cover gskets   vacuum lines
put it all together no problems  so I thought
fire it up idles good  vacuum steady at 15 inches
heres the problem   
no matter where the throttle is placed  it only idles or stalls
what am I missing here
thanks
dave

Offline earlbrown

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Re: throttle response gone??
« Reply #1 on: November 17 2013, 02:28:06 PM »
Is your MAF plugged up?  FPR getting a good vac signal? Spark plug wires on correctly?
'87 GN - 4.2L SFI Turbocharged innercooled V6 - Chrome valve covers - supra pump - 14" K&N - 52mm throttlebody - rocker shaft supports -  1/2 intake spacer - TB coolant bypass - 3" ATR exhaust tip - Alum intake pipe - NOS timing cover - chip - relocated charcoal canister - CR42's - stock

Offline shmed

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Re: throttle response gone??
« Reply #2 on: November 17 2013, 03:20:33 PM »
well I tried it with an without the maf   no difference
wires on correctly  checked twice
theres vac at the fpr 
any more ideas?

Offline Steve Wood

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Re: throttle response gone??
« Reply #3 on: November 17 2013, 03:45:27 PM »
is the tps reading properly on the scanmaster when you open the throttle?
Steve Wood

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A lot of broken parts does not make you a racer; it makes you a slow learner.

Offline shmed

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Re: throttle response gone??
« Reply #4 on: November 17 2013, 04:45:58 PM »
yes goes up an down when peddle pushed


Offline shmed

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Re: throttle response gone??
« Reply #5 on: November 17 2013, 04:56:24 PM »
scanmastre readings
cold af 7  warm af 6
lb 54                lb 48
bat 13.5           bat 13.5 
int 128             int 125
bl 128              bl 117
cle 146             cle 168
ats 60              ats 75
rpm 825           rpm 800-900
tps 44              tps 44
iac 54              iac 91

Offline Steve Wood

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Re: throttle response gone??
« Reply #6 on: November 17 2013, 05:18:20 PM »
what are the o2s at idle warmed up?

If this is in Park, your iac's are way off but i would not think that is the current issue

Is the pcv line connected and is it in the intake?

What is lb above in your readings?
Steve Wood

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A lot of broken parts does not make you a racer; it makes you a slow learner.

Offline shmed

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Re: throttle response gone??
« Reply #7 on: November 17 2013, 05:29:02 PM »
yes pcv still in stock location an hooked up
yes in park  put in drive can only idle   or will stall
lb im not sure what that stands for it comes in like that on the scanmaster.
can I just unplug the iac  tps  mass an try it that way??
any ideas
its a tt chip
worked fine before I fixed all the vac leaks an oil leaks grrrr
what did I  do now

Offline Steve Wood

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Re: throttle response gone??
« Reply #8 on: November 17 2013, 05:33:37 PM »
must be l8 for lv8

What are the O2s warm?

Do the maf numbers change when you try to increase the rpm ?  What do the O2s do when you ease down a bit on the throttle?

Don't see any need to disconnect anything.

Did you double check the wires-I have messed them up more times than I can count even tho I took care to get them right
Steve Wood

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Offline Steve Wood

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Re: throttle response gone??
« Reply #9 on: November 17 2013, 05:54:59 PM »
As coincidences always bite me in the butt, make sure the fuel pressure is where it should be
Steve Wood

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A lot of broken parts does not make you a racer; it makes you a slow learner.

Offline shmed

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Re: throttle response gone??
« Reply #10 on: November 17 2013, 05:56:40 PM »
I triple checked the wires      idles too  good for them to be off
starts   great.
ill let ya know about the rest bit ofa storm here now

Offline shmed

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Re: throttle response gone??
« Reply #11 on: November 17 2013, 06:02:41 PM »
fuel press line off 42   line on 40

Offline Steve Wood

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Re: throttle response gone??
« Reply #12 on: November 17 2013, 06:32:51 PM »
guess i would start by trying to find out why there is such a small fp difference as it should be down in the thirties with the hose connected.  Sounds like you have a pretty good leak somewhere

What are the O2s, idling warm?
Steve Wood

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A lot of broken parts does not make you a racer; it makes you a slow learner.

Offline earlbrown

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Re: throttle response gone??
« Reply #13 on: November 17 2013, 09:51:50 PM »
What do the MAF number do with KOEO while pushing the gas pedal?   Do they go up or stay static?
'87 GN - 4.2L SFI Turbocharged innercooled V6 - Chrome valve covers - supra pump - 14" K&N - 52mm throttlebody - rocker shaft supports -  1/2 intake spacer - TB coolant bypass - 3" ATR exhaust tip - Alum intake pipe - NOS timing cover - chip - relocated charcoal canister - CR42's - stock

Offline bescurred

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Re: throttle response gone??
« Reply #14 on: November 19 2013, 08:34:32 AM »
guess i would start by trying to find out why there is such a small fp difference as it should be down in the thirties with the hose connected.  Sounds like you have a pretty good leak somewhere

What are the O2s, idling warm?

I was sorta thinking this too,  Did you take the intercooler off during these repairs?  I've had my intercooler hoses pop off and the car doesn't like it at all.  Listen to Steve and Earl...they know their shit...

 

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