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| severe stumble and hesitation on light acceleration http://www.pontiacbonnevilleclub.com/forum/everything-electrical-and-electronic/topic50730.html |
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| Author: | bilybbad [ Wed Jun 28, 2017 1:04 pm ] |
| Post subject: | severe stumble and hesitation on light acceleration |
2000 Bonneville SSEI 142000 miles severe hesitation on light accel. runs great on hard acceleration have had repairs done at trusted shop with certified techs replace intake gaskets -fuel pump and sending unit - ftps - purge valve all new vacuum lines and fittings (checked with smoke machine) - new egr tube and valve. throttle body cleaned and gasket replaced air filter and fuel filter replaced - 02 sensor -replaced map sensor -replaced the maf x2 replaced coolant temp sensor - replaced - coils and wires replaced - ignition module replaced spark plugs are good gas cap replaced prior to repairs multiple codes showed --- now no codes but still has same symptoms SEVERE STUMBLE AND HESITATION ON LIGHT ACCELERATION SCAN TOOL SHOWS LEAN CONDITION after all repairs were done maybe worse. can now add stalling to the list. always use premium shell gas. need some help! |
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| Author: | redfury [ Wed Jun 28, 2017 3:18 pm ] |
| Post subject: | Re: severe stumble and hesitation on light acceleration |
I don't see anywhere in the list that the MAF was touched. A bad MAF will cause those problems, because it's the primary source driving fuel richness. WOT ignores all sensors and just pours the fuel into the engine, which is why it runs good at WOT. IF you haven't, try cleaning the sensor wires in the MAF, otherwise replace it. Mine would stumble and die, even after cleaning the MAF...replaced it and haven't had a problem since I've owned the car now. |
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| Author: | 96 SSEi [ Wed Jun 28, 2017 5:30 pm ] |
| Post subject: | Re: severe stumble and hesitation on light acceleration |
x2 on maf - unplug it and see if it improves. |
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| Author: | bilybbad [ Thu Jun 29, 2017 7:52 am ] |
| Post subject: | Re: severe stumble and hesitation on light acceleration |
ordered a new maf this will be the third one that I have installed. drove car 57 miles with it unplugged and car ran great--- but showed a lean condition on scan tool bank 1 o2 sensor reads low and does not change much. plugged in maf sensor and car was hesitating badly jerking the maf sensor was changing on the scanner normal numbers thanks for input me and the guys at the garage are stumped |
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| Author: | 96 SSEi [ Thu Jun 29, 2017 10:29 am ] |
| Post subject: | Re: severe stumble and hesitation on light acceleration |
aftermarket mafs have a high failure rate - I got one from ebay that lasted about 2 years best to get Japanese made OEM - I got one from Harofreak - he has a business in bonny parts bonneville unlimited is the name I believe. the lean cond. may be caused by no maf signal |
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| Author: | bilybbad [ Sat Jul 01, 2017 10:09 am ] |
| Post subject: | Re: severe stumble and hesitation on light acceleration |
found another split vacuum line at supercharger flapper replaced it still same lean condition have a new maf sensor on the way but the one on the car reads good numbers when its hooked up. persistant lean condition baffling us car runs great without the maf. three weeks and holding. even asked st.christofer for some help, but he didn't show up. my neighbor is a minister and he is performing an exorcism at sundown today, on the Bonneville. |
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| Author: | bilybbad [ Sun Jul 02, 2017 5:35 pm ] |
| Post subject: | Re: severe stumble and hesitation on light acceleration |
hey red fury you hit it out of the park new maf solved the stumble but now shows P0171 lean bank 1 but the car runs fine. not sure if it is a valid code as the fuel trim numbers at working as are the o2 sensor numbers. instant fuel mileage is back up too 33 mpg @ 41 mph was fixed at 22 mpg @41 mph thanks for the response I think the exorcism worked a friend in texas bill |
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| Author: | 96 SSEi [ Mon Jul 03, 2017 12:34 pm ] |
| Post subject: | Re: severe stumble and hesitation on light acceleration |
you can: -propane/carb cleaner test it to find the leak. check the line under s/c snout. make sure you have the pcv installed and it has an o- ring. I found a leak by removing the s/c belt to make the engine quite and listening - it was that blocked off hose from on top of the t/b - used high temp silicon adhesive to repair so this lean trim returns to normal under acceleration? |
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| Author: | redfury [ Tue Jul 04, 2017 11:44 am ] |
| Post subject: | Re: severe stumble and hesitation on light acceleration |
Here's what I don't like about these Bonnevilles, I don't see how you can get a Lean Bank 1 code when the car only uses one oxygen sensor. All that means is that it's seeing a lean condition, no particularly on one side of the engine or the other. With that being said, I'd take a water bottle, put a pinhole in the cap and start spraying around the intake gaskets, the throttle body gasket, the supercharger ...anywhere that could suck air. If it's leaking, you'll know. Solvents evaporate to fast, aren't safe to use and are just going to make the engine run better. You'll hear water getting sucked in vs. a spray solvent. |
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| Author: | Matcovich [ Wed Jul 18, 2018 9:02 am ] |
| Post subject: | Re: severe stumble and hesitation on light acceleration |
Good morning. I have the same problem with a 2001 SSEI. Replaced MAF sensor and still same problem. I have been told I need a new ECM (PCM?). Looking for confirmation on that diagnosis, and any fixes that may be available. If replacement is required, I am looking for a place to buy (and program?) a new ECM. Thank you. |
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