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Falling on its face when floored


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#1 DigitalWW

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Posted 14 July 2021 - 08:21 PM

So the car has been sitting for about 10 years.  I'm waking it up now but have reached a popular problem.  When you rev hard, engine spotters and dies.  If you stop reving before it dies it will go back to idling.  It starts beautifully and idles great...  if you start reving slowly the engine will go all the way without any problems.  

It had a bad fuel pump before going to hibernation.  I replaced the pump , added new fuel and it started right up.  

It does have a gsm maf, i had no issues with it before hibernation.  Also the car has 3" exhaust all the way.

I did a tps reset.  It idles fine.  I did lots of searching but cant find a solution.  Please help

Edited by DigitalWW, 14 July 2021 - 08:24 PM.






#2 DigitalWW

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Posted 14 July 2021 - 08:31 PM

Also, it looks like the dieing is happening when boost is introduced.  With no boost it goes high

#3 techboy

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Posted 14 July 2021 - 08:32 PM

Might try replacing the fuel filters as well. The one in the engine bay and the tank, unless you removed the cone one when you replaced the pump. Other thing to consider is sending the injectors to RC Injectors to be cleaned and flow tested. Might be dirty or clogged from sitting.
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1988 Conquest TSi ... current driver - sold to Bigjoe 6/2016
1987 Conquest Flatty ... F/S thread - sold 8/2014
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#4 techboy

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Posted 14 July 2021 - 08:33 PM

If it's a boost thing then your secondary injector probably needs to be replaced.

Edited by techboy, 14 July 2021 - 08:34 PM.

1988 Starion ESi-R ... crushed by a tree 10/31/11 - back from the dead 8/2016
1988 Conquest TSi ... current driver - sold to Bigjoe 6/2016
1987 Conquest Flatty ... F/S thread - sold 8/2014
1987 Conquest TSi ... parts car - sold to Coldscrip 12/2011
1999 Eclipse 4G63 ... heavily modified.
Feeback Thread | Motor rebuild thread | Restoration thread

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#5 DigitalWW

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Posted 14 July 2021 - 08:59 PM

I have another set of injectors and i did replace the secondary with no changes.  Also if i leave the secondary unplugged - nothing changes.  Is there a way to test the secondary injector at home?

#6 croquest87

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Posted 15 July 2021 - 04:29 AM

I suspect fuel filters /rust in your tank being sucked into filters .
Fuel pressure will be normal at idle but once you rev it and engine demands more pressure drops.
I would drop that tank and  clean it along with new filters and all clean from tank to injectors.


#7 87redcat

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Posted 15 July 2021 - 08:04 AM

There was a way to test injectors with a 9v battery. If they click they are at least working. As farcas clean goes someone, I remember, set up a cleaning station of sorts using the 9v to open the injector then either soaked or sprayed carb cleaner through them.
Id send them out. Its not that expensive
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#8 ucw458

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Posted 21 July 2021 - 07:02 PM

Cone filter is my guess.  It happened to one of mine.  Look at the fuel pump inlet and the hose leading to the tank.  If you find a cone shaped filter throw it away.  Do not replace it.  That filter blocks the inlet on aftermarket pumps causing very low fuel pressure under boost.
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