Flooded engine?
#1
Flooded engine?
Hello Guys,
I'm new here on the forum. Recently bought a ZR1 1990. I bought it knowing that the secondary injectors were not functioning properly, hence no full engine power possible.It drives perfectly well on normal engine power though.
Foolishly, I tried the full engine power mode for a quick spin around the block anyway and all was ok... until I hit the throttle. I heard a weird sound, which was instantly followed by a loss in power. I stopped immediately and put the car on the side of the road. The idle was just horrible. One way or another I managed to put the car back in my garage but it's impossible to turn it over now. Won't start. Even in normal power mode.
Did the bad injectors flood the engine?
What should I do next?
Unfortunately I'm not very mechanically inclined, at least not yet. So every bit of detail in your explanation will help tremendously.
Thank you all in advance.
Kind regards.
Hervé
I'm new here on the forum. Recently bought a ZR1 1990. I bought it knowing that the secondary injectors were not functioning properly, hence no full engine power possible.It drives perfectly well on normal engine power though.
Foolishly, I tried the full engine power mode for a quick spin around the block anyway and all was ok... until I hit the throttle. I heard a weird sound, which was instantly followed by a loss in power. I stopped immediately and put the car on the side of the road. The idle was just horrible. One way or another I managed to put the car back in my garage but it's impossible to turn it over now. Won't start. Even in normal power mode.
Did the bad injectors flood the engine?
What should I do next?
Unfortunately I'm not very mechanically inclined, at least not yet. So every bit of detail in your explanation will help tremendously.
Thank you all in advance.
Kind regards.
Hervé
#2
Instructor
You should have gotten a code for that. There are several threads that will explain how to read them with pin jumpers but the best way is to use a scanner.
Sounds like you may have blown a vacuum hose and now have a bad leak.
I would first check the MAP hose. The MAP sensor is on a bracket bolted to the rear of the plenum with a short hose running from the bottom of the sensor to a connection under the plenum.
Sounds like you may have blown a vacuum hose and now have a bad leak.
I would first check the MAP hose. The MAP sensor is on a bracket bolted to the rear of the plenum with a short hose running from the bottom of the sensor to a connection under the plenum.
#4
Le Mans Master
where are you? contact zr1 net registry and chances are there is someone in the area that can help you
not really possible to debug over the internet too well
but yes, pull the plugs and turn the engine over, check for spark and fuel.
sounds to me something else went bad, like maybe fuel pressure regulator or the injectors hung open
do you smell gas?
not really possible to debug over the internet too well
but yes, pull the plugs and turn the engine over, check for spark and fuel.
sounds to me something else went bad, like maybe fuel pressure regulator or the injectors hung open
do you smell gas?
#5
Le Mans Master
Member Since: Oct 2004
Location: South-central Missouri
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You should have gotten a code for that. There are several threads that will explain how to read them with pin jumpers but the best way is to use a scanner.
Sounds like you may have blown a vacuum hose and now have a bad leak.
I would first check the MAP hose. The MAP sensor is on a bracket bolted to the rear of the plenum with a short hose running from the bottom of the sensor to a connection under the plenum.
Sounds like you may have blown a vacuum hose and now have a bad leak.
I would first check the MAP hose. The MAP sensor is on a bracket bolted to the rear of the plenum with a short hose running from the bottom of the sensor to a connection under the plenum.
The MAP hose was my first thought too. OP: a backfire (i.e., that "funny noise") followed by poor running is a classic case of what happens when the MAP sensor hose gets blown off the vacuum nipple (located at the back of the plenum - look for a disconnected rubber/plastic hose).
I'm not buying "bad secondary injectors" w/o more to go on. However, you say *"... I tried the full engine power mode for a quick spin around the block anyway and all was ok... until I hit the throttle."
That fits a bad secondary fuel pump scenario: with the FULL ENGINE POWER switched on, and at lower throttle opening, fuel pressure would be adequate and the engine would run, more or less normal. But, when you 'hit the throttle' fuel pressure would drop as result of a bad secondary pump, and possibly, suddenly be running very lean. If the engine sputtered and backfired as result, it is easy to see how the MAP tube would be blown off of the plenum vacuum nipple, and the motor would run badly as the ECM would have the wrong fuel demand information.
I'd first check to see if that MAP hose is disconnected. If so, re-connect it and see if that doesn't fix the running issue.
From there, with the help of a fuel pressure gauge and a VOM, we can further analyze.
Last edited by Paul Workman; 07-21-2017 at 10:43 AM.