91 engine stumble - Drive Accord Honda Forums | radio-pro.ru
LinkBack Thread Tools Search this Thread Rate Thread Display Modes
post #1 of 6 Old 01-20-2014, 12:02 PM Thread Starter
1st Gear

Join Date: Jan 2014
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
91 engine stumble

A year ago my engine began to stumble when I started it, and the rpm's would drop to 500ish or lower, as soon as I got the rpm's reved up, I could get through it. Then it stumbled as I accelerated hard, like the timing was off. Honda had a "port" issue, that is similar but that had already been corrected by cleaning out the ports.

When I put SEAFOAM cleaner in it, it worked great, but it still wasn't perfect. I changed the sparkplugs and that really did the trick but just a month later it started again but only on acceleration, as time went by it went back to the original problem. Seafoam & CRC cleaners always helped as if it was a clogged injector, but the problem always comes back, the only time it acted right was after replacing the spark plugs a year ago, they are too new to replace again, and only have 10,000 miles or less on them. The former ones had 100,000 miles on them.

As far as I know, the engine has not been timed, it has 250,000 miles on it, spark plug wires are good, found two crossed, fixed that, runs better but can still stumble when it feels like it. Parking the car sloping backwards can trigger it when I restart it.. When I start the car for the first time, it NEVER stumbles, only after I've driven it for 15 minutes, park, and then restart, will it stumble, reving the engine and waiting a minute will let me drive ok, but a hard acceleration always will STUMBLE. Right now I'm just doing trial and error checks, one at a time so I can pin it down.

If I change the plugs again it probably will run great again,for awhile.. Also, one of the spark plug wire/rubber boots did have oil on it when popped out, but not so bad, I check every now and then, seems ok.

Something is shorting electrically: plugs/wires/distributor cap/rotor......or the TIMING is way off. OR, some sensor/valve/carbureator/ issue is not letting it get gas or breathe. I did replace the GAS FILTER, it added performance when the engine is running good but did not correct the problem, I thought it would since the gas filter had not been changed in 200,000 miles.

I suspected water in the gas for the longest time, and it surely had some, using chemicals really helped but it never was perfect. And this is important, the car needs only regular gas but the stumbling is worse,,,, if I use mid grade gas, it runs so much better I can't believe it, and I've checked this 50 times, it runs better end of story. Also, when I changed the plugs the first time a year ago, I no longer needed mid grade gas, it ran good on regular. I'm losing horsepower and gas mileage is down.

the battery
air filter
spark plugs once - a year ago
cleaned ports - this was a Honda Tech bulletin
replaced gas filter
used Sea Foam & CRC
used water removers

timed the engine
replaced PVC/ or other same type filters
replaced distibutor cap or rotor
replaced the spark plug wires recently- but my Honda specialist said they are good for life

I feel I'm getting about 19 miles per gallon......when it should be 25, my driving is rural, about 70% steady, 50mph, 30% city stop and go.

when I start for the first time, no stumble, runs good, after driving 15 minutes, maybe it will stumble when I start again, or maybe not, it does sometime depend on the angle of parking, sloping back bad, slightly forward ok.....when I accelerater hard, ALWAYS hesitates or stumbles, drive normal ok......sometimes it will just stumble on it's own, best thing is to shut off engine and wait.....

Last edited by Greenbamboo; 01-20-2014 at 03:03 PM. Reason: correction
Greenbamboo is offline

post #2 of 6 Old 01-23-2014, 07:53 PM
4th Gear

05and91's Avatar

Join Date: May 2012
location: Dallas, TX
Posts: 217
Thanks: 2
Thanked 4 Times in 4 Posts
Water in the Gas

Maybe different than your problem, and you've already tried some chemicals, but I'll post this because it might help others searching. About 5 years ago my 1991 Accord would sputter, hesitate and misfire while taking off from being stopped at a light. I suspected water in the gas because it started right after I filled it up in the middle of a 2 week period of non-stop heavy rain. When I first cranked it up and drove it, it was OK. It would do it after I was already driving and only when taking off from a stop, usually taking off from being stopped at a light.

Several mechanics all quoted me different expensive repairs (fuel pump, distributor etc), and all mechanics claimed it was NOT "water in the gas" when I told them what I suspected.

I replaced the plugs, distributor cap and other things with no improvement. Finally I tried a bottle of "Iso-Heet" water remover (from Walmart). It improved after the first bottle, and more after each additional bottle (one bottle at every fill-up), and after doing this for about 4 or 5 fill ups (guestimate), the problem was gone and it's never returned. I still have the car.

So it WAS water in the gas, even though every mechanic I asked said that wasn't the problem. I don't know if how the Iso-Heet's added makes any difference, but I would drive the car until it was almost empty, then I would pour in the bottle of Iso-Heet at the gas station while it's on empty, wait about a minute then fill it with gas. And just to make sure all the water was gone, I continued adding the Iso-Heet at each fill up for a couple months after the problem stopped. I've never used the stuff before or again since then.

05and91 is offline
post #3 of 6 Old 03-19-2014, 05:59 PM Thread Starter
1st Gear

Join Date: Jan 2014
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts

Your post is interesting as water has always been a prime suspect. I live in a humid state on the east coast and I do not fill this tank full, I usually only go 1/3 to 1/2 so that leaves a lot of air space. The chemicals i used equal the ISO-HEAT, but to your point, I have used ISO-HEAT too. I actually wanted to drain the gas from the tank and see how much water came out but there is no draincoc to do so, thus it would have to siphoned and I don't consider that the same. Just filling it up and using a gas dryer as you suggest is probably the best route to flush the gas tank.

However it has been running ok, just can't put the pedal to the metal, it will stumble. Going to "time' the engine, and replace distributor cap and rotor and see what that does.

But with 250K on the engine, I wonder if I can get back the original power.

One more thing of interest: I added some Bardahl 'no smoke' to seal a oil leak, wow, it improved the compression and really picked up the performance, I recommend that one for all, I was surprised at the new found horsepower..


Last edited by Greenbamboo; 03-19-2014 at 06:02 PM. Reason: spelling
Greenbamboo is offline

post #4 of 6 Old 03-20-2014, 07:18 AM

SatinSilver's Avatar

Join Date: Mar 2007
location: Ohio
Posts: 6,322
Thanks: 38
Thanked 106 Times in 66 Posts
If the fuel in your area contains ethanol, usually 10% for winter blend then that should take care of water in the tank. Try some and click on retailers. I would buy a bottle of Chevron Techron which might still be bogo at O'Reilleys.
SatinSilver is offline
post #5 of 6 Old 09-14-2015, 04:56 PM
My First Post

Join Date: Sep 2015
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
My 1991 Accord was stumbling under low acceleration. I found my problem and I believe it's the same many of you are having. It turned out to be the ecu needed to be reset. It got messed up. My battery had gone dead while I was doing some body work over a one year period. Occasionally, I would jump start it so that I could move it around. That meant I was resetting the ECU Constantly. The problem is, if you reset the ECU after it is warm or reset the ECU in the middle of it's learning cycle, you set your sensor parameters incorrectly into the ECU's memory. In my case, My temperature sensor's parameters were off. While I was having the acceleration stumbling problem, I unplugged the TW sender, no more stumbling. I tested the sensor, it was within specs. Reset the ECU properly, the problem went away.

Good luck. I went through all that you guys have gone through. EGR, distributor, timing, torque converter, spark plug wires and plugs. None of them really explained the stumbling only under low acceleration, when warmed up. It was not intermittent, it was under very specific circumstatances. Bad parameters, explained why the check engine light did not come on. Bad parameters explained why, when I disconnected the sensor, the ECU went to warmed up default condition for that sensor, so the car ran fine when the sensor was disconnected.

Good luck and let me know what you find.
Yetars is offline
post #6 of 6 Old 05-12-2016, 10:23 AM Thread Starter
1st Gear

Join Date: Jan 2014
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
SOLVED: I posted this a year ago but apparently it didn't complete. My Honda tech friend discovered the problem, a broken spark plug boot, split vertically about 3 inches - new plug wires, phenomenal performance. I checked the easy ones I could reach EARLY ON, but this was second one in and skipped it, I wasted so much gas with that hesitation - he took one look and found it in 30 seconds. Have 265K now, engine runs great! JEFF
Greenbamboo is offline


Quick Reply

Register Now

In order to be able to post messages on the Drive Accord Honda Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
The answer to the random question may be found under the Off Topic section of the forums and in the "Drive Accord Forums" category.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Linear Mode Linear Mode
Rate This Thread:

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to

Related pages

karr car alarmusing 10w30 instead of 5w30pzev emissionsdrivers seat tabhonda idle control valve2006 honda pilot timing belt replacementcastrol 0w-20 synthetic oilinterchangeable rims chartaverage brake lifeprecut window tint kitshancock winter tireshonda mower registrationtrunk latch not workingngk izfr6k-11xenondepotare tinted tail lights illegalhonda accord clubdtc p1399honda fit mugen body kit1998 honda civic ex tire size2004 nissan maxima code p03001995 honda accord vinchange timing belt honda accordhonda accord transmission swaplexani lss 101999 honda accord window regulator9th gen honda accordhonda accord sport leasehonda goudy alhambraturtle wax bufferhow much does it cost to install a car radiosunroof wind deflector worth ithvac compressor replacement costmugen nrbest buy car stereo with aux inputsteering pump pulleyhonda accord glove boxplastidip lowespennzoil semi syntheticcheck vsa system honda odysseylexus es generations2004 honda accord power steering hoseg37 wheelwiper blade noisehonda accord 1998 owners manualoutside temperature sensor for carswhere to buy dip dissolvermugen nrekm3 enkeiecm honda accordmid city motorworld2004 acura tl tail lightsviper vss5000 review2004 honda civic radioautocraft gold warranty95 honda accord windshieldremove pinstripep1381 honda accord 2000mercedes transmission fluid change costwires needed for subwoofer and ampengine start relaystash spots for weedtsx rim2006 honda accord wiper blade sizepennzoil rebate1997 honda accord grill2012 accord coupe v6 specswww sonicelectronixhonda element headlight bulb replacementcar shakes when at a stoppiston rod knockhonda care pricingnew brake pads but still squeaks03 vw jetta mpghonda odyssey headlight bulbsilicone wiper1997 honda civic owners manual2006 honda accord euro reviewsyphon gasacura lug pattern2003 acura mdx air conditioning problems