Loss of power on canyon run.
#1
Loss of power on canyon run.
Symptoms: Cruising down the highway I have a sudden loss of power with boost dropping to zero and RPMs dropping steadily. I attempt to downshift and give it gas with no luck. I pull off to the side of the road and let the car sit for a few minutes. I attempt to start the engine and it starts, revs to about 2000 rpm, studders/shudders and then dies. I do this a couple of times, while holding down the gas and it won't hold an idle and just slowly drops until it dies. Car basically can't start and if it does, will not hold an idle for more than a quarter of a second and dies.
Troubleshooting: Upon initial inspection, no lines or hoses were blown off. We don't suspect a vacuum issue because it won't even hardly start to hold an idle. The engine should start and rev fine, just not build boost. I don't think it's an electrical issue because all the lights and displays were working with no issue. Car turns over fine and I don't think spark is an issue. We're thinking the TPS has gone bad or is mis-adjusted. Another thought would be the manifold absolute pressure sensor (with paper diaphragm). Those will be the first two checked and evaluated. Vacuum lines and hoses will also be inspected with the UIM off. Plugs will be replaced and engine will be de-flooded.
Any suggestions while we attack this is greatly appreciated.
Troubleshooting: Upon initial inspection, no lines or hoses were blown off. We don't suspect a vacuum issue because it won't even hardly start to hold an idle. The engine should start and rev fine, just not build boost. I don't think it's an electrical issue because all the lights and displays were working with no issue. Car turns over fine and I don't think spark is an issue. We're thinking the TPS has gone bad or is mis-adjusted. Another thought would be the manifold absolute pressure sensor (with paper diaphragm). Those will be the first two checked and evaluated. Vacuum lines and hoses will also be inspected with the UIM off. Plugs will be replaced and engine will be de-flooded.
Any suggestions while we attack this is greatly appreciated.
#4
Can I just use a wally world code puller from Kragen, or do I need a Mazda unit? I've never pulled codes on my FD, but I'm glad you guys mentioned that.
Injectors are about 1.5 years old.
Edit: CEL never kicked on either (not that that means much...)
Injectors are about 1.5 years old.
Edit: CEL never kicked on either (not that that means much...)
#5
Mr. Links
iTrader: (1)
First thing, get it towed somewhere and have a compression test done on it. You basically only need three things for the car to start and run:
1. Compression
2. Fuel
3. Ignition
Driving is something else, but if you car won't idle you have a problem with one of those three. Typically with those symptoms, it's #1 but that is at least the easiest to check. Just buy or borrow a cheap piston compression tester and use that:
http://www.rotaryresurrection.com/3r...ion_check.html
It won't give you "exact" compression numbers, but it will give you the general health of your engine.
1. Compression
2. Fuel
3. Ignition
Driving is something else, but if you car won't idle you have a problem with one of those three. Typically with those symptoms, it's #1 but that is at least the easiest to check. Just buy or borrow a cheap piston compression tester and use that:
http://www.rotaryresurrection.com/3r...ion_check.html
It won't give you "exact" compression numbers, but it will give you the general health of your engine.
#6
EFR IWG 8374
Join Date: Aug 2003
Location: C. Springs
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im pretty sure thats a map sensor, I forgot to plug back in the electrical connector to it one day and I got the exact starting symptoms you are describing. Also some times the vacuum line pops off when boosting so that would explain it dying when you were boosting it.
good luck,
Jason
good luck,
Jason
#7
First thing, get it towed somewhere and have a compression test done on it. You basically only need three things for the car to start and run:
1. Compression
2. Fuel
3. Ignition
Driving is something else, but if you car won't idle you have a problem with one of those three. Typically with those symptoms, it's #1 but that is at least the easiest to check. Just buy or borrow a cheap piston compression tester and use that:
http://www.rotaryresurrection.com/3r...ion_check.html
It won't give you "exact" compression numbers, but it will give you the general health of your engine.
1. Compression
2. Fuel
3. Ignition
Driving is something else, but if you car won't idle you have a problem with one of those three. Typically with those symptoms, it's #1 but that is at least the easiest to check. Just buy or borrow a cheap piston compression tester and use that:
http://www.rotaryresurrection.com/3r...ion_check.html
It won't give you "exact" compression numbers, but it will give you the general health of your engine.
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#8
Corea FD
iTrader: (8)
Mahjik and Archie----- first I have quested the ignition issue as well---he has great spark next i have questioned the fuel delivery issue by checking the system. I have the compression test issue as my last suggestion to Archie!!!!
I am thinking is a very minor issue but who the hell knows
I am thinking is a very minor issue but who the hell knows
#9
Compression test done using a regular piston compression tester utilizing Kevin Lander's method:
106 on the front peak with pulse bounces 38-40
93 on the rear peak with pulse bounces around 39-41
Compression is not great but not absolutely terrible. At any rate, It should still start and idle with that compression correct?
106 on the front peak with pulse bounces 38-40
93 on the rear peak with pulse bounces around 39-41
Compression is not great but not absolutely terrible. At any rate, It should still start and idle with that compression correct?
#10
I attempted to pull the codes using this method:
http://rx7city.com/ecucodes.htm
I didn't see any flashing off any of the lights on the gauge display. Maybe I'm not understanding what "MIL" is? Insight?
http://rx7city.com/ecucodes.htm
I didn't see any flashing off any of the lights on the gauge display. Maybe I'm not understanding what "MIL" is? Insight?
#12
compression is on the limit i guess. you better save for rebuild.
if your car is not USDM, it wont have CEL light on the dash. for Euro and JDM FDs you need a led and 680ohm resistor to connect it to + side of battery and FEN (or MEN i dont remember exactly) terminal. search for it.
if your car is not USDM, it wont have CEL light on the dash. for Euro and JDM FDs you need a led and 680ohm resistor to connect it to + side of battery and FEN (or MEN i dont remember exactly) terminal. search for it.
#14
compression is on the limit i guess. you better save for rebuild.
if your car is not USDM, it wont have CEL light on the dash. for Euro and JDM FDs you need a led and 680ohm resistor to connect it to + side of battery and FEN (or MEN i dont remember exactly) terminal. search for it.
if your car is not USDM, it wont have CEL light on the dash. for Euro and JDM FDs you need a led and 680ohm resistor to connect it to + side of battery and FEN (or MEN i dont remember exactly) terminal. search for it.
Yeah, that's what I've been up to at this point. I want to know the true issue, before considering rebuilding. A rebuilt engine with blown fuses or bad connections wouldn't do me any good.