Catalytic converter or transmission?

Asked by Apr 04, 2015 at 07:44 AM about the 1998 Chevrolet Blazer 2 Door LS

Question type: Maintenance & Repair

I have a 98 chevy blazer that started losing power a month ago on an incline. Up until then, the car ran great. The reading i got
from the auto store were egr sensor,  catalytic , and maybe 1 other. I replaced the egr, mass air flow, o2 sensor, spark plus and
wires, fuel filter, and pour in fuel cleaner. I sent it to a shop and explained that i was losing  acceleration on an incline, hoping that
they will diagnose the catalytic converter and replace it. To my surprise  they call me hours later and explained that the
transmission is going bad and it is not even shifting into first gear. But i haven't  experienced that problem or transmission
symptoms. They guy said the car is done and he does not recommend a new or old transmission. I need a second opinion. I was
hoping to replace the catalytic  converter.  It is had to believe  that it is the transmission without prior symptoms  or showing on
the diagnostic reading. Thanks

6 Answers

34,955

Have you noticed that the vehicle is not down shifting when going up hills? Have you manually tried shifting down into 3'rd when you feel a loss of power going up hill? I doubt it's the cat. You would notice a power loss at all times. Is it showing any error codes? Is the check engine light on?

1 out of 1 people think this is helpful.
16,865

Would need more info to really diagnose. Confirm what gear it's in and make sure your getting all 4. A common failure is the shift solenoid. Sometimes it will drop 1st and 4th gear. However you shouldn't be dropping all the way to 1st unless your trail riding or towing things you shouldnt. Clogged cats usually give a false redline and is noticeable on hills or flat ground.

I went to the auto shop today. The mechanic now say that it may be that Blazer's computer is bad and therefore it is not reading the o2 sensor, egr sensor, and signaling a bad transmission.

(apologies if this makes not senese) but Also to hopefully to answer the question. He said that it would not shift out of first gear. Well I asked the mechanic to drive it with me in the truck because I had not experienced it. During the drive it shifted into 1st gear immediately, then again at 3000 rpm. He was convince that the truck was done until I explained the above and the parts that i replaced as well. The truck would not pass emission due to readiness. I drove 150 miles and the same 3 (erg, o2 and catalytic converter) continue to show. He also ran the diagn. showed the same thing and a code if not mistaken, 4.0 or 4.4 (he checked with his laptop).

The check engine light is on.

34,955

First these guys think it's the cat then they're telling you the transmissions bad and to basically scrap the car. Now they're telling you it's the computer. I would bring it elsewhere. I think these guys are just fishing for a big bill. You will have to take it to a good shop to have it properly diagnosed. It could be the BCM or the PCM. When the mechanic says things like, "Well maybe it's this or maybe it's that." that's your clue to go elsewhere. They will be blindly replacing parts and you'll be footing the bill. And once they replace electrical parts, they usually won't give you your money back.

Your Answer

Add photo

Related Questions

  • Transmission oil????? 5 answers

    Hi there, I own a 1996 Chevy Blazer LT and so far everything is in order. Now I got a little Problem with the Transmission = it's leaking. Does anybody know how much Oil the Transmission needs (4 Spe...

    1996 Chevrolet Blazer 4 Door LT 4WD

    -

    Maintenance & Repair

  • my 2004 chevy blazer started stalling out,codes read mass air flow senser. so I got a new one but it still wont run. anybody know what it could be? 1 answer

    trying to figure out what the problem is on my blazer and hoe to resolve it

    2004 Chevrolet Blazer 4 Door LS 4WD

    -

    Maintenance & Repair

  • Transmission 2 answers

    I need some one to tell me the name of this part on my transmission something can be replaced

    2001 Chevrolet Blazer 2 Door LS

    -

    Maintenance & Repair

  • Transmission 1 answer

    Will a 2000 model trailblazer transmission fit in my 1997 chevy blazer?

    1997 Chevrolet Blazer 4 Door LT 4WD

    -

    Maintenance & Repair

  • Transmission 2 answers

    My transmission keeps slipping and i was told i might need a whole new transmission or just maybe needs fluid if so does it nees to be in park or nuetral to check transmission fluid

    2005 Chevrolet Blazer 4 Door LS 4WD

    -

    General

Blazer

Looking for a Used Blazer in your area?

CarGurus has 1,374 nationwide Blazer listings starting at $2,000.

ZIP:

Search Chevrolet Blazer Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

Chevrolet Blazer Experts

#1 Andrew Olsen
Andrew Olsen
Reputation 1,840
#2 yetilikesbeer
yetilikesbeer
Reputation 1,110
#3 dandyoun
dandyoun
Reputation 660
View All

Related Models For Sale

Used Chevrolet Tahoe
852 Great Deals out of 28,369 listings starting at $1,700
Used Chevrolet S-10
10 Great Deals out of 1,632 listings starting at $1,795
Used Chevrolet Silverado 1500
2,741 Great Deals out of 149,178 listings starting at $1,500
Used GMC Jimmy
294 listings starting at $1,500
Used Ford Explorer
1,204 Great Deals out of 71,146 listings starting at $1,000
Used Jeep Grand Cherokee
999 Great Deals out of 65,973 listings starting at $1,500
Used Chevrolet Camaro
475 Great Deals out of 39,921 listings starting at $3,499
Used Ford F-150
3,213 Great Deals out of 205,088 listings starting at $1,779
Used Jeep Cherokee
334 Great Deals out of 52,606 listings starting at $2,200
Used Jeep Wrangler
490 Great Deals out of 17,959 listings starting at $2,950
Used Chevrolet C/K 1500
1,095 listings starting at $1,895