firecat

Hello new to hear, i have a small problem, car runs great,but say after 15 mins of driving, Check engine lights comes on, no flashing light just on,when this happens it wont rev, bad bog ect, but turn the key off then on again,or pull over and start it again and its fine? motor runs strong , no smoke,lost of power,untill it trips the engine light then it runs like crap, but will idle fine,but misses and bogs if you rev it up..

Thanks for any heads up.i did swap the mass air flow,and pressure switch, should i swap in another ECU. i do have a spare car same year etc.

RotaryRocket88

iTrader: (7)

Yes, it does sound like limp mode. Likely an OMP failure, and then ECU damage because of it. Pull engine codes to be sure: http://www.johnr.com/cpucodes.html.

firecat

Thanks i will check it out. What is the OMP? and again thanks!!

firecat

Also to get something right, we are talking about the ECU on the passenger side and not the CPU on the drivers side? Thanks

firecat

Oil Meter Pump? OMP?

jjcobm

iTrader: (18)

yes oil metering pump. This is most likely your problem. Pull the codes by grounding the single green pin on the drivers side next to the battery, key on engine off. You can get a new used OMP from the classified sections here if thats your case. Sometimes the bad OMP ends up killing your ecu too....

Without that pump working, don't drive the car as you don't have any lubrication going into the combustion chamber.

kiker14

iTrader: (1)

$10 says it's the OMP - use the search feature of this web site, this issue has been covered many many times and even quite a few times in the past few months (even by me!) if you have questions once you've searched let us know.

firecat

if so, is it safe to drive?or better not to. Thanks

jjcobm

iTrader: (18)

If you really need to drive it, run some premix in there.....

firecat

thanks i will check it all out now, so look for a 20 code and the others, also i do have a parts car as well,, thanks again

firecat

ok if i got this right, it seems i have 3 codes but i am little lost well kinda i get

long,short,short,,,,,,,,,,,,,long short,short,short,short,short,short,short
long,short,,,,,,,,,,,,,,,,short 7 times
long short,short,,,,short 3 times

can i disconect the battery to clear the old codes and then get current?

2slow4stock

iTrader: (18)

jjcob he needs a working omp for him to drive. Premixing won't help him any, he's s5.

Codes

12 - Throttle sensor - full range
17 o2 sensor
13 - pressure sensor.

Are you sure you are reading the codes right?

firecat

ok i have it now . i waited for it to complete it a few times so i have code

30-3
12-17
20-7
now i did change the MAF and pressure sencer

jjcobm

iTrader: (18)

Just saying if he REALLY needs to drive the car somewhere, he should at least premix.

Im alittle confused when you say 30-7, 12-17, and 20-7. Does that mean codes 30-33, 12-17, and 20-27? Do you have emissions removed on the car?

rx7racerca

iTrader: (1)

Not sure if I'm interpreting your shorthand; is the string of commas representing the 2 second pause between codes? And the separate lines - different codes in the sequence? They should go from low to high codes (numerically), with the longs for 10's followed by shorts for the ones, and 2 sec pause between different codes, 4 sec pause before repeating the whole sequence.

If you're sure you've read the codes correctly, you can clear and try driving it again to see if they come back - likely unless the problem is repaired first (try the suggestion in the link posted above to try "predicting" the sequence after you've watched it several times and written it down to be sure you've read it correctly).

If I interpret your notation correctly, you're showing 03, 07, 11, 12, 17 - but the order posted above is 12, 17, 11, 7, 12, 3, which doesn't seem likely, unless you wrote the strings down out of order. So I'm not reading your notation right, or you may have made errors reading the codes. None of the above, if I've read correctly, is the MOP, but instead relate to ignition (3-CAS ground), air and fuel - IAT and TPS (11, 12), and O2 pos feedback. Again, I think I'm either misreading what you wrote, or you made a mistake with the codes, but if they are correct, the problem seems likely to lie with a bad ground, which these cars are known for - too many unrelated sensors and systems, unless tied by a common element like a bad engine ground, or damage to wiring. Check your various grounds for good condition and freedom from corrosion at the bolt-downs or the exposed cable (or swollen/lumpy sections of the insulation that might indicate water/salt got in the jacket and corroded the wire inside.

Drive with caution: MOP problem (which I'm not going to say we've eliminated, because I'm not sure I've got the codes right) won't be immediately lethal to your engine, but it ain't good even in the short-term, either. MOP failures (and the subsequent ECU damage) can also be caused by water leaking into and corroding/shorting the front turn signals. Are the front signal lenses intact, and the light housing's free of apparent moisture or dirt inside?

firecat

no mabey i am not explaining right 1st code 3 long flashes pause 3 short,,,then 1 long,2short pause,1long7 short,,then 2long ,pause7short then it repeats


And when the engine light comes on ,,it bogs,so if i turn the car off and on,light goes off and it is fine for 15 teen to 20 min

rx7racerca

iTrader: (1)

Ah, big changes with the new post, but still not sure what you're conveying - 33, 12, 17, 27 (?) are again out of order, so I'm not sure I'm understanding what you wrote. 27 is MOP, so the premix suggestion if you must run the car is a good idea until you're sure - cheap insurance.

firecat

yes every thing clean and new, and dry, i just finished a complete rebuild and this car has been stored in a heated shop for the last 13teen years, but this problem was their when i drove it home for the rebuild, thanks for the help,

rx7racerca

iTrader: (1)

Ah, fresh rebuild - I'd definitely be looking for ground issues (a ground painted over on the engine or the engine bay before being reattached, for example?), or damaged wiring harness (maybe when the engine was pulled? Been there, done that, spent the hours cussing, finding, and fixing).

firecat

the codes are from as soon as i turn on the ign, First code is 3long then pause 3 short
then 1long 2 short pause1long,7 short then pause..then 2 long pause 7 short

firecat

K i am a ***,, redid the codes 12---17-----then 20---7---then 30----3-- SORRY ,, then it just repeats

firecat

well i am going to go over every ground and harnest today and nite , to look for the bad or crimped harnest,, thanks any info is totaly helpfull,Oh and i have sat in the side lines ,untill the car was finished, I just wanted to say Great Site and People!

jjcobm

iTrader: (18)

Well its still alittle confusing as to how you are interpreting the codes. You say 30----3, the ecu outputs the codes in order, so it won't go from 30, back down to 3 (unless 30 was the last code and you had a code 3 to start off with at the beginning). if its 33 it would be, long-long-long-short-short-short, 27=long long, shortx7....

Pull the upper intake manifold off, make sure you got the ground that goes under that, here is aaron cakes's guide:

http://www.aaroncake.net/RX-7/grounding.htm

But regardless, if it is throwing that OMP code, there is a problem there, and like said previously, it can lead to a burnt out ecu....

firecat

thanks i have a intake kit , so i will check it out,if i am not mistaken the OMP was changed along with everything..else from the engine builder in alberta.canada,,but it was allmost 2 years ago, it took me a long time to finish this car, but its allmost done

firecat

k i have finished went over every ground wire and changed every bolt, checked every vaccum line, one was off,ground wires needed cleaning, changed the tps because i did have a code for that,, so with the codes cleared, new battery,mass-air flow,pressure sencer, and tps changed, so off for a drive was looking good but 15 min into the drive tripped engine light,turned off car and started it again and drove home still no light ,,but again 15 min into it engine light,but i was home, so hooked up the ground wire to read the codes ,, so now its a 27-33, only flashes 2times long then pause flashes7 times fast, then flashes 3 times long and 3times fast. i did do a vid of it but i thought it was not needed because now it only had 2 codes