Bad Performance of V6

Submitted: Monday, Jan 02, 2006 at 13:02
ThreadID: 29305 Views:2400 Replies:7 FollowUps:3
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This is my first posting, I was wondering if anyone can shed light on my problem.
I have a 1991 V6 4 Runner dual/ fuel which does not go to well when running on petrol, its OK on LPG, but has a real problem exceeding 3000rpm when on petrol, is sluggish, missfires a lot and has no power, if you persevere and keep the gas pedal down to the floor, it leaps into life again around 4500rpm (not that there is much left that high up the rev range ) Low end grunt is also lacking on petrol. I have played around with the air flow sensor & it has improved somewhat, but compared to running on LPG its gutless. The motor has just been rebuilt to gas specs.( valve seat recession caused by the previous owner not ever running it on petrol I recon ) & I have had the LPG system altered to start on petrol, & fitted a Moreys flash lube system to it, but still the problem exists. Any ideas....
Also reading threads on fuel economy of the V6 I have to agree these are thisty suckers, On petrol I get 14.5L/100k country & 17.7 city & on LPG only 19/21 respectively. (on one rather hairy 4 wheel track I managed 32 l/100km, impressed ? )
Still I reckon its a great off roader, haven't found much that will stop it yet.
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