My 1999 Toyota Avalon is running rough and vibrating especially when put into gear.

40

Asked by Feb 20, 2013 at 01:21 AM about the 1999 Toyota Avalon 4 Dr XL Sedan

Question type: Maintenance & Repair

First I changed the coil packs and spark plugs like I was told to ,not by y'all but by the owner. When I
did the car ran a little better but still running rough and vibrating,so I did a compression test and
cylinder 1 & 2 had no compression and cylinder 2 the spark plug had oil on the fire end . Please I
need help my buddy said I might need a new motor but the motor has only a 131,560 miles on it I
am praying that I can fix this what ever it may be wrong with it ,also the other cylinders had
awesome compression. Please I need help I don't have a lot of money and have a wife to take to
work and 2 little boys to get around and I need to get this fixed.

6 Answers

If you have 2 cylinders that have absolutely 0 compression, to state the obvious, that is a serious problem, stuck valves or something. If the timing belt broke it would not run at all. I need to go look and see if it is DOHC, one cam is not turning maybe

2 out of 2 people think this is helpful.

Yeah, it's a 3.0L V6 DOHC, one cam opens exhaust the other intake, as opposed to one cam opening valves on one bank. I don't know the lay out, which is 1 and 2 on the same side? Or 1 and 2 on opposite banks.? With proper maintenance that engine should go well beyond 131,000 ..my point being one cam could have the sprocket stripped or broken off cam, not turning, and since it operates valves on 1 and 2 both be it intake or exhaust, there is your no compression. You may not need a NEW motor but the top end is going to have to be looked at.

1 out of 1 people think this is helpful.

It has 24 valves.

1 out of 1 people think this is helpful.
Best Answer

This is a lot of work. Please pay close attention to the last two sentences. Disconnect any component needed to access the timing belt covers. Remove the mounting bolts on the lower timing belt cover with a socket wrench and disconnect the lower cover. Release the clamp for the engine wire protector on the rear timing belt cover and detach the engine protector. Remove the mounting bolts for the upper timing belt cover and disconnect the upper cover. Disconnect the bolts for the right engine mounting bracket with a socket wrench and remove the bracket. Disconnect the the guide for the timing belt. Turn the crankshaft clockwise to align the timing marks for the timing belt. The groove on the crankshaft pulley must align with the mark on the oil pump. The timing marks on the camshaft pulleys must align with their respective marks on the rear timing belt cover. Remove the bolt for the crankshaft pulley with a socket wrench. Loosen the two bolts for the timing belt tensioner alternately to keep the timing belt aligned. Disconnect the timing belt tensioner and its dust protector. Detach the timing belt from the pulleys. Try to turn the camshaft pulleys by hand. If one freewheels, the pulley is broken off of the cam. It should turn, but not without some effort as it is opening/closing 12 valves. This advice is a lot of work, please don't even begin if you don't have the time or tools and is not a guaranteed thing, only to see if my suspicion that one camshaft is not turning is correct. I could be way off the mark but with 0 compression in 2 cylinders it's my best shot.

Afterthought: it will run on one bank. That is what led me to my conclusion. There are other possibilities, it has good compression on the other 4 leads me AWAY from the sprocket and entire camshaft. A cam can break. Rare but happens. geez it would be wise to wait and see if anybody else has a better idea, if nobody else chimes in, well, redundant but it's my best shot..and if you bought it from a dealer report his ass to BBB, if just some guy from the listings, he knew he sold you a POS , and you have to do SOMETHING to see what's wrong

Good compression in the other 4 renders this advice useless. I'm having second thoughts...but a camshaft can break, rare, but happens. But I suppose you have to so SOMETHING to figure out why there is 0 compression in 1 and 2. By looking at both sides with the timing cover off. START WITH JUST valve covers off before you really rip it apart look for differences, anomalies from one side to the other. I simply can't come up with anything but valves for 0 compression and you may want to wait until somebody else has a better answer. I don't want to send you off tearing it apart on my account and be way wrong

Your Answer

Add photo

Related Questions

Avalon

Looking for a Used Avalon in your area?

CarGurus has 15,949 nationwide Avalon listings starting at $1,100.

ZIP:

Search Toyota Avalon Questions

Toyota Avalon Experts

#1 FordNut
FordNut
Reputation 1,540
#2 Tom Demyan
Tom Demyan
Reputation 1,500
#3 lilfrosty357
lilfrosty357
Reputation 700
View All

Related Models For Sale

Used Toyota Camry
1,431 Great Deals out of 99,709 listings starting at $700
Used Honda Accord
1,205 Great Deals out of 77,327 listings starting at $700
Used Nissan Maxima
422 Great Deals out of 24,977 listings starting at $1,500
Used Toyota Corolla
1,297 Great Deals out of 67,026 listings starting at $1,595
Used Toyota RAV4
1,099 Great Deals out of 53,307 listings starting at $1,588
Used Chevrolet Impala
920 Great Deals out of 36,052 listings starting at $1,500
Used Toyota 4Runner
381 Great Deals out of 19,763 listings starting at $1,987
Used Nissan Altima
1,090 Great Deals out of 85,580 listings starting at $695
Used Acura TL
313 Great Deals out of 7,037 listings starting at $2,000
Used Honda Civic
1,131 Great Deals out of 63,725 listings starting at $995

Used Cars For Sale

2017 Toyota Avalon For Sale
2,587 listings starting at $28,911
2016 Toyota Avalon For Sale
19 Great Deals out of 6,307 listings starting at $19,999
2015 Toyota Avalon For Sale
38 Great Deals out of 845 listings starting at $17,995
2014 Toyota Avalon For Sale
52 Great Deals out of 909 listings starting at $15,495
2013 Toyota Avalon For Sale
89 Great Deals out of 1,583 listings starting at $13,400